Question

The time taken by a sound wave having a frequency of 4 kHz and wavelength of 40 cm to travel 4 km is ___ .

Answer 1

Frequency,v=4 kHz = 4000 Hz

Wavelength, l = 40 cm = 0.40 m

We know,

$V=l\times v=0.40\times 4000=1600\frac{m}{s}$

Now time taken, $t=\frac{d}{v}=\frac{(4\times 1000)}{1600}=2.5s$