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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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What is the safe limit of sound level of db for our ears?
Chapter: [7] Sound
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What is the sound level for noise pollution?
Chapter: [7] Sound
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What change do you expect in the characteristics of a musical sound if
(i) Its frequency is increased,
(ii) Its amplitude is increased?
Chapter: [7] Sound
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Name the unit used to measure the sound level.
Chapter: [7] Sound
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In fig. 2 two musical notes of the same pitch and same loudness are played on a violin and on a piano. Their wave forms are as shown in the diagram below. Explain why the wave patterns are different.
Chapter: [7] Sound
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State the condition when on applying a force, the body has the translational motion.
Chapter: [1] Force
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