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Q.

The frequency of a man's voice is 300 Hz and its wavelength is 1 meter. If the wavelength of a child's voice is 1.5 m, then the frequency of the child's voice is:

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a

200 Hz

b

150 Hz

c

400 Hz

d

350 Hz

answer is A.

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Detailed Solution

f1λ1 = f2λ2           (300)(1) = (f2)(1.5)            200 Hz = f2
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