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What is the range of hearing for a normal person?
Chapter: [7] Sound
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Name the principle used to find the depth of a sea.
Chapter: [7] Sound
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Give two applications of supersonics.
Chapter: [7] Sound
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What are the lowest and highest limits of frequencies of sound which is audible to a human ear?
Chapter: [7] Sound
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What do you understand by sound signalling?
Chapter: [7] Sound
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Distinguish between compression and rarefaction.
Chapter: [7] Sound
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Write two differences between transverse and longitudinal waves.
Chapter: [7] Sound
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Fig. shows three ways in which a string of length l in an instrument can vibrate.
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| (i) | (ii) | (iii) |
- Which of the diagram shows the principle note?
- Which vibration has the frequency four times that of the first?
- Which vibration is of the longest wavelength?
- What is the ratio of the frequency of the vibration in (i) and (ii)?
Chapter: [7] Sound
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Distinguish between music and noise.
Chapter: [7] Sound
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Name three factors on which the frequency of vibration of a stretched string depends.
Chapter: [7] Sound
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A boy fires a gun and hears the echo 2 seconds later. If he is 480 m away from a wall, calculate the velocity of sound in air.
Chapter: [7] Sound
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A girl claps and hears the echo after reflection from a cliff which is 660 m away. If the velocity of sound is 330 ms-1, calculate the time taken for hearing the echo.
Chapter: [7] Sound
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Define the term wavelength applied to a sound wave.
Chapter: [7] Sound
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What is the wavelength of sound waves produced in air by a vibrating tuning fork whose frequency is 256 Hz when the velocity of sound in air is 330 ms-1?
Chapter: [7] Sound
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In fig. shows a snap shot of a wave from of frequency 50 Hz in a string. The numbers in the diagram represents distance in centimeters. Fpr the wave motion, find
(a) Wavelength,
(b) Amplitude,
(c) Velocity.
Chapter: [7] Sound
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