Question

Derive an expression for the apparent frequency of 240 Hzapproaches a station with a velocity of 30m/s. Find the apparent frequency of sound heard by a listener standing on a platform.(V= 330m/s) *​

Answer 1

The word "apparent" means "as observed at a particular point X". Different observers will observe different frequencies depending on their relative velocity to the source. This doesn't change the frequency of the sound that is generated; just the frequency of the sound that arrives at the ear of the observer.

Answer 2

Answer:

Na= 264 Hz

Explanation:

Vo= 0 m/s , N= 240 Hz , V = 330 m/s

Na = N x ( V + Vo / V - Vs)

Na = 240 (330/300)

Na = (240) x (11/10)

Na = 264Hz

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