A larger amplitude means a louder sound, and a smaller amplitude means a softer sound. Standard 8 students should practice questions and answers given here for Science in Grade 8 which will help them to improve your . 256 Hz. Characteristics of sound. Answer: Sound is produced when an objects vibrates. motion of the medium. Question 14: Mark the following statements true or false. (a) When sound propagates in air, it does not carry energy with it. Both sounds travel through the same medium, that is, air and arrive at our ear at the same time. F. Sound can be produced by beating an object irrespective of whether these are vibrating or not. Answer. The medium can be solid, liquid or gas. When lightning occurs in the sky, the sound of the lightning comes after, but before we are able to see it in the sky. Depending upon the vibrations, a sound is produced. Hang it at a convenient place in such a way that it does not touch any wall. 4. Its speed through vaccum is 3 × 10 8 m/s. Example- Rolling of thunder is due to successive of sound from multiple surfaces like clouds and land. 3. 7. Sound waves are longitudinal waves. Answer: Voice box (larynx) Question 5: Name the organs of hearing in our body. hello students welcome to leader learning's question and answer videos my name is palibi and i teach math and science at leader let's have a look at this very interesting question in front of us which characteristics of sound make makes it possible to recognize a person by his voice without seeing him so this question also goes to all the music lovers who like the music of some artists right . Q. Transverse Waves: A wave in which the particles of the medium vibrate up and down 'at right angles' to the direction in which the wave is moving. The Characteristics of Sound!<br /> 2. Light PPT For Class 7 & 8 CBSE Jay Butani. (i) Amplitude: It is the maximum distance in one side from the mean position of an oscillatory motion. Pick the odd one out and state the reason for your choice: Time period, Pitch, Shrill, Loudness. Q. Solution: Wavelength = speed of air (v) / frequency (ν) Wavelength = 320/ 450= 0.711 m. QUESTION: 3. RESPONSIVE Visible performance-based work (as a result of . The mod 8 physics class is smoking the mod 2 physics class…90 to 84! It distinguishes between a loud sound and low sound. Three different vibrating objects produce three types of sounds X, Y and Z. Characteristics of Sound 2. Assertion (A): Two persons on the space cannot talk to each other. "Frequency" is how fast the waves are crashing on the shore. Frequency is expressed in hertz. (b) In a longitudinal wave, compression and rarefaction are formed. In addition, learn to define sound as a wave and understand the significance of a tuning fork in the study of sound. Sound : Sound is a form of energy which produces a sensation of hearing in our ears. What are the Characteristics of Sound Waves? These waves are produced only in a solids and . In normal conditions, the speed of the sound in air is just 332 m/s, but the speed of the light is 3 × 10 8 m/s. This compression and expansion create a minute pressure difference that we perceive as sound. They are classified on the basis of frequency heard by human beings sound is classified into two parts: Audible sound . (ii) Give one example of forced vibration. Perfect Pitches with a Rubber Band Guitar (grades 6-8): Use Google's . The sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. A sound is actually a form of energy that travels as a wave away from its source. • Sound of single (same) frequency is called tone while a mixture of different frequencies is called note . These vibrations make air molecules move. You would have seen doctors use stethoscopes to hear your heartbeat. Sound Intensity and Decibel Level Properties of Sound, continued Pitch is determined by frequency. ther medium there is no bodily. Thus, it is highest in gases and least in solids. Pitch Pitch refers to the highness or lowness of a sound. F. Excessive noise can cause deafness. One hertz (Hz) refers to the complete cycle of sound waves per second. Sound Class 8 Science NCERT Intext Activities Solved. Concepts covered in Concise Physics Class 8 ICSE chapter 7 Sound are Properties of Sounds, Characteristics of a Sound Wave, Sound, Propagation of Sound, Representation of a Wave, Loudness and Intensity, Pitch (or shrillness) and . Sound Class 9 Notes For Science Chapter 12. Sound cannot travel in vacuum. The quality of two sounds with the same fundamental frequency differs because of the number and relative loudness of the -----. The part of a longitudinal wave where the particles of the medium are close together. Question 4: Name the sound producing organ in humans. 3) Transverse waves travels in the form of crest and trough. In more sonic terms, frequency is the rate at which a sound wave completes a cycle. It is therefore so important that we take the time to understand what the hell these . Sound can travel through solids, liquids and gases. It is a mechanical wave that is created by the back and forth vibratory movement of the particles of the medium (air, water, etc) through which it travels. Sound is produced by the vibration of the body. it cannot travel in vacuum. The Class 8 Science Sound Worksheets are made with a lot of research on the topic so that all the concepts that are related to it are crystal clear. 13.1). This is due to the different characteristics associated with the sound. The sound which is pleasing for the ear are called _____ (a) Lonely sound (b) Solo sound (c) Echo (d) Musical sound. Propagation of Sound. But the sounds we receive are different. When sound is conveyed from one medium to ano. Ans. True or false? CHARACTERISTICS OF THE 21ST CENTURY ASSESSMENT The following eight characteristics of 21st century assessment, are essential guide for preparation of assessment activities by educators. Slide unit 6 light Mc Zuliza . All sounds are made by vibrations of molecules through which the sound travels. Activity 2. Read the assertion and reason carefully and choose the correct answer: 1. The pitch of a sound is dependent on the frequency while the loudness of a sound depends on the amplitude of sound waves. Objective Questions Sound ICSE Class-8th Concise Selina. Each vibrating body is a source of sound. → It helps us to distinguish between two sounds of same pitch & loudness. The sensation when reaches our ear, goes to our brain; our brain processes it and we can hear the sound. Since the thermocol ball is pushed away by a large distance, this means that the tumbler is vibrating with large amplitude. External Ear: The external ear or pinna appears like a funnel. All sound waveforms (your stone) is comprised of 7 characteristics. We can also say that it is a form of energy and it comes from vibrations. iii) Name the characteristics of sound which enables a person to differentiate between two sounds of the same soundness and frequency but produced by different instruments. Class 8 Physics Sound Characteristics of Sound Sound is characterized by 2 important features Frequency Amplitude Frequency : The number of oscillations per second is called the frequency of oscillation. You may have heard echoes when in the mountains, whereas you may have heard annoying reverberations in empty halls. Answer. Activity 1 (NCERT Textbook, Page 158) Take a metal plate (or a shallow pan). In this lesson, we will explore the reflection of sound. The characteristics of sound are as follows: Pitch Loudness Quality Vibrating Parts of Musical Instruments Veena - Stretched string Tabla - Stretched membrane Drum - Stretched membrane Shehnai - Air Column Flute - Air Column Pitch Pitch is a characteristic of sound by which a correct note can be distinguished from a grave or a flat note. Intensity is measured in decibel (dB). Lightning and thunder take place in the sky at the same time and at the same distance from us. frequency that a normal middle-aged adult can hear is only 12 to 14 kilohertz if the frequency of sound falls within this range it is called an audible sound that is the range between 20 to 20 kilohertz do you know why we cannot hear some sounds while other living things like a bad can we cannot detect some sounds which have frequency (a) High (b) Low (c) Equal (d) None of these. 4. For instance, when a drum or a cymbal is struck, the object vibrates. Answer: Our ears are the organs of hearing in our body. (c) The loudness of sound is measured in hertz. Sound cannot travel in a vacuum. Most vibrating objects generate sound of several frequencies simultaneously. False. Some animals like birds, frogs etc., also produce sound due to vibration of their vocal cords. The Characteristics of light : Light is an electromagnetic wave. Topics covered in the lesson are Introduction, Echo, Wave, and its types, Audible and inaudible sound, Characteristics of sound, Ultrasound and its applications, Sound needs a medium to travel, SONAR, Speed of sound, Human ear, Sonic boom . Sound is the term to describe what is heard when sound waves pass through a medium to the ear. They are all artistically enhanced with visually stunning color, shadow and lighting effects. (ii) Pitch or Frequency Pitch of sound directly depends on frequency. Class IX ScienceNotes for Sound. The matter or substance through which sound is transmitted is called a medium. Explanation We know that sound is produced due to vibration of particles (To and Fro Motion) In to and fro motion, an object moves from its central position More it moves from its central position, more is the amplitude Less it moves from its central position, less is the amplitude Note - More Amplitude means More Loudness of Sound True or false? Give reason why a large drum produces a louder sound than a small . (iii) quality or timbre. 2. Pitch and Frequency • Sound waves with a high frequency have a high pitch and sound waves with a low frequency have a low pitch. What are the characteristics of sound waves? external ear, middle ear and internal ear. Source of sound and its propagation : A source of vibration motion of an object is normally a source of sound. Its SI unit is watt/metre 2. Read and download free pdf of CBSE Class 8 Science Sound Worksheet Set C. Students and teachers of Class 8 Science can get free printable Worksheets for Class 8 Science in PDF format prepared as per the latest syllabus and examination pattern in your schools. In Figure 10.2 sound C is louder than sound B. A true vacuum refers to the complete absence of matter. Sound is a form of energy that produces sensation of hearing. Q. (b) A sound with large amplitude is louder than one with small amplitude. Class 8. Characteristics of Musical Sound. A wave in which the vibration is in the same direction as that in which the wave is traveling; sound waves. Our free STEM Lesson Plans show you how to integrate these activities in the classroom! Three of the characteristics described by National Council of Teachers of Mathematics (NCTM), in the document "Principles to Actions" under the category "Access and Equity Principle" are as follows: Develop socially, emotionally and academically safe environments for mathematics teaching and learning - environments in which students . Its function is to catch sound waves and to direct them towards middle ear. Baby girl is likely to have minimum frequency. Assertion (A): Sound travels four times faster in water than through the air. Characteristics of Sound. Sound cannot travel through a vacuum. State one observation from everyday life which shows that sound travels slower than light. Human voice danica parajes. They produce sound by moving their wings up and down very fast. pitch: a measure of how high or low a sound is perceived to be, depending on the frequency of . Timbre is a quality of musical tone to distinguish between two sounds when they are of the same frequency. The characteristics of sound waves affect the waves and the propagation in different ways, there are 5 basic characteristics of the sound wave. Characteristics Of Longitudinal And Transverse Waves Class 11 - Class 8 Sound #Part-02 Longitudinal & Transverse wave . Sound timbre is known as the characteristic waveform of sound that depends on the material from which it produces. All these things have one thing in common, reflection of sound. All media have three properties which affect the behavior of sound propagation: 1. The speed of light decreases in denser media. Reason (R): Sound travels 13 times faster in solid than through the air. Lakhmir Singh Science Class 8 Chapter 13 Questions Based On High Order Thinking Skills (HOTS) Question 101. Both sounds travel at the same speed irrespective of the source. Question 1. It is through sound we know that a period in school is over or if someone is approaching you by just listening to the footsteps. . A siren has 16 holes and is making 960 revolutions per minute. Characteristics of Sound Waves. These vibrations create sound waves which move through medium such as air and water before reaching our ears. The sound moves through a medium by alternately contracting and expanding parts of the medium it is travelling through. It is based on the amplitude of the vibration and will be louder when the amplitude is high. What are Audible and Inaudible sound ? Frequency = No of oscillations Time (in seconds) This shows that sound travels slower than light. A part in a longitudinal wave where the particles are spread apart. The three characteristics of sound are (i) Loudness, (ii) Pitch and (iii) Quality or timbre. Sound needs a medium to propagate: A medium is necessary for the propagation of sound waves. For example, if a generated sound level of 80 dB is measured in the source room and 30 dB is s$^{-1}$}\). Sound is produced due to the vibration of objects. Light travels in a straight line. The characteristics of sound! Q48. Characteristics of Sound Sound produced by any means has the following characteristics, namely, loudness, pitch or shrillness, and quality or timbre. This is the first part of the notes in which you will get a crisp and brief explanation of important topics like production . Loudness is the physiological response of the ear to the intensity of sound. The movement of molecules of a medium is essential for the propagation of sound waves. Sound requires a material medium i.e. steady sound in the source room and measuring the sound level in both the source and receiving rooms. (3) Low vapor pressure—to keep . A. But bees do not have the voice-boxes. 2. Question 6: Name that part of ear which vibrates when outside sound falls on it. 2. F. Curtains, cushions and rugs absorb sound. The sound moves through a medium by alternately contracting and expanding parts of the medium it is travelling through. 2. Question 3. The human ear can generally perceive sound between 20Hz and 20,000Hz. Vibration can be described as a back and forth motion of an object. • Sound wave propagates as compressions & rarefactions in the medium. We, the human beings, produce sound when our vocal cords vibrate on blowing air through them by our lungs. Sound cannot be produced without any vibration. Differences in sound levels in the rooms determines the transmission loss characteristics of the material tested. The vibration of a source sets the amplitude of a wave. T. The unpleasant or unwanted sound is termed as music. (i) Loudness. properties of sound. The speed of sound is more in solids, less in liquids and least in gases. The sound produced by a tuning fork has no harmonics. The loudness of sound is proportional to the square of the amplitude. 4,96,741 The pitch of a sound that you hear depends on the frequency of the sound wave. 8. Sound . Question: (i) Draw a displacement-distance graph for two waves A and B such that the amplitude of wave A is three times that of wave B. Some of the other reasons to go through these worksheets along with the solutions are as follows: It can be considered as an ultimate guide to the concepts. Voice of which of the following is likely to have a minimum frequency? Vibration is the rapid to and fro motion of an object. We can also observe this difference in our daily life during the phenomenon of lightning. The frequency of the sound produced by the siren is: A. Reflections, echoes, and reverberation. Reason (R): There is no medium in the space. Loudness: It is a feeling of how strong a sound wave is at any place. Human ear, which gives us the sense of hearing is a complex structure. The purpose of this experiment is to examine what effect the characteristics of the medium have on sound. Sound CBSE Class 9 Science Chapter 12 - Complete explanation and Notes of the chapter ' Sound'. Characteristics of Sound waves Sound waves are those vibrations which when approaches our ears, are taken to the brain, and the brain then processes the information so that the sound is heard. 8. Loudness: the human perception of how much energy a sound wave carries<br /> 3. . Light can travel in vacuum. 9. sound wave: a longitudinal wave that is caused by vibrations and that travels through a material medium . Question 2. When the amplitude of vibration of Steel tumbler is large, the sound produced is very loud. Pitch is one of the characteristics. The velocity of light changes when it travels from one medium to another. Sound and Vibrations 1: Rubber Band Guitar (grade 1): See how vibrations cause sound waves. It is a relative term and has no dimension quantity. Sound can travel through (a) gases only (b) solids only (c) liquids only (d) solids, liquids, and gases Answer: (d) solids, liquids, and gases. This relationship, affected by temperature, determines the speed of sound within the medium. The stone. Thus, 5,000Hz is equal to 5,000 cycles per second. Even when two sounds are of equal intensity, we may hear one as louder than the other because our ears detect it better than the . 1. Our ICSE Class 8 Physics video lessons are a great way to relearn sound propagation and sound production. In physics, the sound characterises as pitch, frequency, loudness, and timbre. Flute ----- a type of musical instrument. For improving your academic performance, you can also utilise our revision notes, sample papers and practice tests to be . Rewrite the false statements correctly. → Noise is unpleasant to hear while music is pleasant to hear and it is of good quality. Loudness The loudness of sound depends on its amplitude. Characteristics of the medium required for the propagation of sound: (i) Medium must be elastic so that the medium particles have the tendency to return back to their original positions after . through solids, liquids and gases. (a) Sound has three properties-loudness, frequency and quality. Question 2. Musical sound has three characteristics (i) Intensity or Loudness Intensity of sound is energy transmitted per second per unit area by sound waves. Its symbol is Hz. The loudness of sound depends on the amplitude of vibration of sound producing objects. Sound Class 8 Science NCERT Textbook Questions Question 1. Characteristics of sound 1. It controls the loudness of sound, more the amplitude more loud the sound. The high frequency makes the high pitch and the pitch is low if the frequency is less. See the fact file below for more information about sound. How do loudness and pitch of sound depend on amplitude and frequency respectively? Note - The sensation of sound persists in our brain for about 0.1 seconds. 1. / Examples of longitudinal waves include one way to remember the movement of particles in longitudinal waves is to use the 'p' sound:. Our new CrystalGraphics Chart and Diagram Slides for PowerPoint is a collection of over 1000 impressively designed data-driven chart and editable diagram s guaranteed to impress any audience. Middle Ear: The middle ear is composed of a . 10. A roar of a lion is louder than a woman's voice. Hence sound waves cannot travel through the emptiness of vacuum. Light is a transverse wave, and does not need any medium to travel. Think of sound like a wave in the ocean washing up on a beach. Write true or false for each statement. Sounds can be distinguished from one another by the following three different characteristics: loudness; pitch or shrillness, and; quality or timbre Shape of the outer part of the ear is like _____ (a) Funnel (b) Elephant ear (c) Both of these 5. Lightning is seen earlier and thunder is heard later. Sound needs a medium to travel. Hence, the sound is a wave. Let's discuss the characteristics of sound waves like amplitude, frequency, wavelength, and timbre. Every sound we hear depends on its source. Light can travel through vaccum. Characteristics of sound are: (i) loudness. It is the characteristic of musical sound. Sound Class 8 Notes - Chapter 13 Sound plays an important role in our life. A stretched rubber band when plucked vibrates and produces sound. Sound takes time to strike and reflect back, so we are clearly able to hear our voice echo. Sound requires a material medium for its propagation and can be transmitted. For a simple pendulum; define:- a) One oscillation b) Time period c) Frequency. Light is a transverse wave, and does not need any medium to travel. Vibrating objects produce sound. All sounds are a combination of pure frequencies. 9. Sound is a form of energy. 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