Question

A sound wave has a frequency of 500 Hz and
wavelength 80 cm. How long time will it take to
travel 1 km ?
(A) 25 seconds
(B) 25 minutes(C) 2.5 seconds (D) 2.5 minutes​

Answer 1

Answer:

(A) 25 sec.

Explanation:s

Here, Frequency 'f' = 500Hz

Wavelength'a'= 80cm= 0.8m

Since, Velocity 'V'= f×a

V= 500×0.8

V= 400 m/s

Now distance, = 1km = 1000m

So, Time = distance/velocity

Time =1000/400

Time = 2.5sec

Answer 2

Answer:

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