Question

A sound wave has a frequency of 4 kilohertz and wavelength of 40 cm the time taken by the sound wave to travel a distance of 4 km

Answer 1

Answer:

Explanation:

Here we are given the frequency as 4 kHz

We know that 1 kHz = 1000 Hz

So , 4kHz = 4000 Hz

Frequency, f = 4000 Hz

Also ,

Wavelength , λ = 40 cm

1 cm = 0.01 metres

So , Wavelength , λ = 0.40 metres

We know that 1 kilometre = 1000 metres

So ,

3.2 kilometre = 3200 metres

We know that ,

Velocity = frequency x Wavelength

= 4000 x 0.40

= 1600 m/s

Also ,

Time = Distance/Velocity

= 3200 / 1600

= 2 s