Question

A sound wave has frequency 2kHz and wavelength 40 cm. Calculate time it takes to travel 4km.
A. 2 minutes B. 4 seconds
C. 5 seconds D. 2 seconds

Answer 1

Heyy mate ❤✌✌❤

Here's your Answer....

⤴️⤴️⤴️⤴️⤴️⤴️⤴️⤴️

Answer 2

Frequecy=f=2hz

Wavelength=λ=40cm=0.4m

Distance= 4Km- 4000meter
A/Q

Since we know that :-

V=fλ

By using the above formula we will find velocity (v):-

V=2×0.4

V=0.8m/s

So as we know that:-

V=S/t

Therefore:-

T=S/V

Now,

T= 4000m/0.8ms
T=5000 seconds