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  • A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer standing beside the railway track. The frequency (f) of the sound by the obse

A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer standing beside the railway track. The frequency (f) of the sound by the observer is plotted against time (t). Which represents the best resulting curve?

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

When the engine approaches the observer,

f_{1}=f\left(\frac{v}{v-v_{s}}\right)>f \text { but constant }

When it moves away from the source,
f_{2}=f\left(\frac{v}{v+v_{1}}\right) <f \text { but constant }
 

Posted by

vishal kumar

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