A siren emitting a sound of frequency 1200 Hz moves towards you, and away from a

Question

A siren emitting a sound of frequency 1200 Hz moves towards you, and away from a cliff at a speed of
15 m/s. (a) What is the frequency of sound you hear coming directly to you from the siren? (b) What is the frequency of sound you hear reflected from the cliff? (speed of sound = 340 m/s)

i figure the equation used for part a would be f(obs) = f(source)v/(v+v(source)) it is v+vs in denominator since source is moving away from the observer. but i am not sure if i am on the right track, and not sure about part b, wouldn't it be the same once reflected or in that case it would be the same eqn but v-v(source) in the denominator as the sound is coming towards the observer?

please help

Explanation / Answer

the frequency heard by a stationary observer from amoving source is given by :

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