Abat, flying toward the east at 2.0 m/s, emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the bat at the instant the shriek is emitted. sound travels at 340 m/s in the air. how many milliseconds after emitting the shriek does the bat hear the reflected echo from the wall?

The bat hear the reflected echo after 117.6 s after emitting the shriek.

Explanation:

Given:

It is given that the shriek is reflected back at the same instant it is emitted.

So the total distance travelled sound in air is 2d =40 m.

The time taken in reaching to the wall and coming back to the bat is same.

Let t be the time taken given by

Explanation:

As we know that bat emits the sound when it was at distance of 20.0 m from the wall

so the time taken by the sound to reach the wall is given as

Now in the same time distance moved by bat is

now distance between bat and the wall is given as

now since reflected sound and bat both moving towards each other so here time taken to reach the sound again on bat is given as

so total time taken is given as

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y