Question

Harry standing 440m away from a wall fired a gun and heard its echo 2s after.How is an echo formed?calculate the velocity of sound in air?

Answer 1

distance covered by sound=2 x 440 =880 m
time taken to covered 880 m is =2sec
so , speed of sound=880/2=440m/sec

Answer 2

$\huge\mathfrak\fcolorbox{black}{white}{Answer}$

Starting point = 440m away from wall

Distance covered = Starting point X echo

$= > 440 \times 2 \\ = > 880$

Time taken = 2sec

So, the speed of sound is

$= > \frac{distance}{time \: taken} \\ = > \frac{880}{2} \\ = > 440$

$\fcolorbox{black}{white}{speed of sound is 440}$