Question

A sound wave has frequency 1000 Hz and speed 320 ms-1. How long will it take to move through 1 km.​

Answer 1

$\huge!{\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

The answer is 2.94 seconds .

Explanation:

We know that  

Velocity = frequency x wavelength

Given data:

Frequency = 1000 Hz

Wavelength = 34 cm 34/100 = 0.34 m

Velocity = 1000 Hz x 0.34 m

Velocity = 340 ms-1

Distance = 1000 m

Formula of velocity  

Velocity = distance / time

Time = distance / velocity

Time, t = 1000 m / 340 ms-1

t =  2.94 seconds

 $\huge\boxed{\fcolorbox{white}{pink}{Hope!it's helps u...xd}}$

Answer 2

$\sf\boxed{\huge{\rm{Answer:}}}$

3 s.

$\sf\underline{\huge{\rm{Solution:}}}$

$\rm{Distance\:travelled = 1000 m}$

$\rm{Speed\:of\:the\: sound = 330 m s^-1}$

$\rm{Time\:taken\: by\: the\:wave \:to \:move\: through \:1 km= \dfrac{distance}{speed}}$

$\rm=\dfrac{1000m}{330ms^-1}= 3.03 ≈\bf{3\: s}.$

________________________________