Amirror faces a cliff, located some distance away. mounted onthe cliff is a second mirror, directly opposite the first mirrorand facing toward it. a gun is fired very close to the firstmirror. the speed of sound is 342 m/s. how many times does the flash of the gunshot travel the round-tripdistance between the mirrors before the echo of the gunshot isheard?

To develop this problem, we simply have to make a relationship between speeds. This is because the echo of the sound is traveling a distance equal to that which the light travels.

We must calculate how much is that relationship of round trips between the two, as well

Where

c = Speed of light

s = Speed of sound

By definition we know that

(Normal conditions)

Then,

Therefore the flash of the gunshot travel the round-trip distance between the mirror around to 876680.3 times before the echo of the gunshot is heard.