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Q.

Sound wave of 512 Hz moves with a speed of 340 metre per second in air. What will be the speed of a sound wave of frequency 256 Hz?


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a

330 m/s    

b

334 m/s   

c

340 m/s   

d

660 m/s 

answer is C.

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Detailed Solution

At a given temperature, a sound wave of 256 Hz travels with the same speed with which a wave of frequency 512 Hz is travelling. Therefore the speed of sound waves of 256 Hz in air is 340 Hz. The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium.
 
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