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Question

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

A
200Hz
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B
150Hz
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C
400Hz
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D
350Hz
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Solution

The correct option is A 200Hz
We know that ,
f=cλ
So,
fmansvoicefchildsvoice=cλmansvoicecλchildsvoice
fmansvoicefchildsvoice=λchildsvoiceλmansvoice
300fchildsvoice=1.51
fchildsvoice=3001.5
fchildsvoice=200Hz

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