A small animal like a bat emits sound waves of frequency 68 000HZ The speedof sound is 340m/s?

Question

what is the wavelength of these sound waves?
(b) The sound waves emitted by the bat are reflected from a wall in an empty room. what happens if anything to the amplitude and frequency of the waves on reflection?
Amplitude ---------------------------------
Frequency --------------------------------
(ii) why are the sound waves unlikeely to have been diffracted as well?
(c) Undern what circumstances could these sound waves be diffracted?

Answer 1

a)wavelength w= speed/frequency = 340/68000=5*10^-3=0.005m

b)the frequency does not change

ii) Souds with lower frequency has less directivity. they are more diffused than reflected