When both the listener and source are moving towards each other, then which of the following is true regarding frequency and wavelength of wave obserseved by the observer?
Answers
Answer:
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Explanation:
According to Doppler's effect, whenever there is a relative motion between a source of sound and listener, the apparent frequency of sound heard by the listener is different from the actual frequency of sound emitted by the source. Let S be source of sound and L the listener of sound. Let v be the actual frequency of sound emitted by the source and λ be the actual wavelength of the sound emitted.
If v is velocity of sound in still air, then
λ=vv
If velocity of listener is v1 and velocity of source is vs, then
apparent frequency of sound waves heard by the listener is
v′=v−vLv−vS×v
Then vs is positive and v1 is negative.
∴v′=v−(vL)v−vSv=(v+vLv−vS)
ie, v′>v
Also, λ′<λ
So, listener, listens more frequency and observes less wavelength.
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