First slide

Characterstics of wave

Question

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:

Moderate

A

200 Hz
B

150 Hz
C

400 Hz
D

350 Hz

Solution

$f_{1} λ_{1} = f_{2} λ_{2}$
$(300) (1) = (f_{2}) (1.5)$
200 Hz = $f_{2}$

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