The wavelength of the detected sound when the projectile is at h is:

Explanation:

This is quite a very easy one. Would have been better if it were a question to solve, but then since it isn't.

The wavelength is usually given as the ratio between the speed of the sound, with respect to the frequency of the sound.

Succinctly put, if the speed of the sound is 200 m/s, and it's frequency is 50 Hz, for example. Then the wavelength is

200 / 50 = 4 m.

I hope that's clear?

are you like autistic or something?

xd

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