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Q.

If the velocity of sound in air is 340 ms-1, then what is the frequency of a wave whose wavelength is 1 m?


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a

170 Hz

b

340 Hz

c

120 Hz

d

240 Hz 

answer is B.

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Detailed Solution

The frequency of the wave whose wavelength is 1 m is 340 Hz.
Given,
The wavelength of the wave, λ= 1 m
The velocity of sound in air, v= 340 ms-1.
We know that the velocity of a sound wave (v) is the number of wavelengths covered in unit time. Mathematically,
V=λν
where λ is wavelength and ν is frequency. It can also be written as
 ν=Vλ
On substituting the given values, we get the frequency as
 ν=3401
 ν=340 Hz
Hence, the frequency of such wave is 340 Hz.
 
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