Question

...................................?​

Answer 1

$\huge\bold\purple{Answer:-}$

solution: The distance travelled by the sound not

wave

For

= 2 x distance from man to wall.

= 2 x 40

= 80 m.

... Time taken to travel the distance =

=distance/speed

=80 m / 330 m/s

= 0.24s

...The man will hear the echo 0.24 s after he

shouts.

Answer 2

GIVEN,

distance of a man= 40m

speed of air = 330 m/s

TO FIND,

Time taken = ?

SOLUTION,

SPEED=DISTANCE / TIME

therefore,

TIME = DISTANCE / SPEED

= 40 / 330

= 0.1212 sec

APROX.. 0.12 sec

therefore,

after 0.12 sec the echo will heard.

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