A sound wave has a frequency of 1 kHz and wavelength 0.25 m, to travel 2.2 km it takes:

2 \frac{3}{7} s

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80 \frac{2}{5} m i n

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\frac{5}{4} m i n

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8 \frac{4}{5} s

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Solution

The correct option is C $8 \frac{4}{5} s$
$V = v λ$
$= 10^{3} H z \times 0.25 m$
$= 250 m s^{- 1}$
Time taken to travel 2.2 km
$\frac{D i s t a n c e}{V e l o c i t y} = \frac{2200 m}{250 m s^{- 1}}$
$= 8.8 s = 8 \frac{4}{5} s$

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[11200 Hz, Yes.]

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