Sound Worksheet-6
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Name the type of waves produced when a tuning fork is struck in air.
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What is the general name of the waves consisting of:
(a) Compressions and rarefactions?
(b) Crests and troughs?
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State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave,
(ii) At right angles to the direction of wave.
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What type of waves are illustrated by the movement of a rope whose one end is fixed to a pole and the other end is moved up and down?
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What should an object do to produce sound?
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What is the name of the strings which vibrate in our voice box when we talk?
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Name the device which is used to produce sound in laboratory experiments.
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What is the nature of sound waves in air?
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What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch the surface of water in a beaker, the water gets splashed?
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State whether the following statement is true or false :
Sound produced by a vibrating body travels to our ears by the actual movement of air.
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Which of the following travels slowest in air and which one fastest?
Supersonic aircraft, Light, Sound
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Which term is used to denote a speed greater than the speed of sound?
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In which medium sound travels faster: air or hydrogen?
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A tuning fork has a number 256 marked on it. What does this number signify?
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What is the time-period of a tuning fork whose frequency is 200 Hz?
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Calculate the frequency of a wave whose time-period is 0.02 s.
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What will be the change in the wavelength of a sound wave in air if its frequency is doubled?
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If 20 waves are produced per second, what is the frequency in hertz?
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What is vacuum? Explain why sound cannot travel through vacuum?
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Explain the term 'amplitude' of a wave. Draw the diagram of a wave and mark its amplitude on it.
Answer:
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Longitudinal waves
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(a) Longitudinal waves, (b) Transverse waves
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(i) Longitudinal waves, (ii) Transverse waves
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Transverse waves
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Vibrate
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Vocal cords
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Tuning fork
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That the prong of tuning fork are vibrating
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False
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Slowest: Sound
Fastest :Light
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Supersonic
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hydrogen
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Frequency of the tuning fork
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5 × 10–3 s
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50 Hz
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Wavelength is halved
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20 Hz
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Sound waves need material medium to travel
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