Question

A sound wave has a frequency of 3khz and wave length of 80cm. How long will it take to travel 3km

Answer 1

ν = 3 x 10³ Hz 
λ = 80 x 10⁻² m 

c = 3 x 10³ x 80 x 10⁻² = 240 x 10 = 2400 m Hz

t = 3 x 10³ / 2400 

t = 3 x 10³ / 2400 

t = ( 1/8 ) x 10 = 0.12 x 10 = 1.2 sec