Question

A sound wave has frequency of 2 khz and wave of 35 cm how long will take to travel 1.5 km?

Answer 1

Hi there !!!

Here we are given the frequency as 2 kHz

We know that 1 kHz = 1000 Hz

So , 2kHz = 2000 Hz

Frequency, f = 2000 Hz

Also ,

Wavelength , λ = 35 cm

1 cm = 0.01 metres

So , Wavelength , λ = 0.35 metres

Here , in this question we are asked to find the time taken to cover the distance of 1.5 kilometres.

We know that 1 kilometre = 1000 metres

So ,
1.5 kilometre = 1500 metres

We know that ,
Velocity = frequency x Wavelength

= 2000 x 0.35

= 700 m/s

Also ,

Velocity = $\frac{Distance}{Time}$

So ,

Time taken = $\frac{Distance}{Velocity }$
=$\frac{1500}{700}$

= 2.14285 seconds (approx.)

So ,
The time taken to cover a distance of 1.5 km or 1500 metres is 2.14285 seconds

Answer 2

Hi friend ,

Frequency = 2KHz = 2000 Hz
Wavelength = 35 cm = 0.35 m
Speed = wavelength × frequency
Speed = 0.35m× 2000Hz
Speed = 700m/s

time = distance / velocity
Time = 1.5×1000m/ 700
Time = 15/7 s
Time = 2.1 s

Thus sound will take 2.1 s to travel a distance of 1.5 km.
------------------------------
Hope this helped u...
PLZ MARK AS BRAINLIEST..