Propogation Of Sound Waves Numerical 8a
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Q1 The heart of a man beats 75 times a minute. What is its (a) frequency and (b) time period
The time period of a simple pendulum is 2s. Find its frequency
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Q2 The separation between two consecutive crests in a transverse wave is 100m. If wave velocity is 20 m s-1, find the frequency of the wave
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Q3 A longitudinal wave travels at a speed of 0.3 m/s and the frequency of a wave is 20Hz. Find the separation between the two consecutive compressions
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Q4 A source of wave produces 40 crests and 40 troughs in 0.4s. What is the frequency of the wave?
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Q5 An observer A fires a gun and another observer B at a distance 1650m away from A hears its sound. If the speed of sound is 330m/s, find the time when B will hear the sound after firing by A
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Q6 The time interval between a lightning flash and the first sound of thunder is 5s. If the speed of sound in air is 330 m/s, find the distance of the flash from the observer.
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Q7 A boy fires a gun and another boy at a distance hears the sound of fire 2.5s after seeing the flash. If the speed of sound in air is 340m/s, find the distance between the boys.
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Q8 An observer sitting in a line of two tanks watches the flashes of two tanks firing at each other at the same time, but he hears the sounds of two shots 2s and 3.5s after seeing the flashes. If distance between the two tanks is 510m, find the speed of sound
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Q9 How long will sound take to travel in (a) an iron rail and (b) air, both 3.3km in length? Take speed of sound in air to be 330m/s and in iron to be 5280m/s
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Q10 Assuming the speed of sound in air equal to 340 m/s and in water equal to 1360 m/s, find the time is taken to travel a distance 1700m by sound in (i) air and (ii) water
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