A train moves towards a stationary observer with speed $$34$$ $$m/s$$. The train sounds a whistle and its frequency registered by the observer is $$f1$$. If the train’s speed is reduced to $$17$$ $$m/s$$, the frequency registered is $$f2$$. If the speed of sound is $$340$$ $$m/s$$ then the ratio $$f1/f2$$ is

Question

A train moves towards a stationary observer with speed $$34$$ $$m/s$$. The train sounds a whistle and its frequency registered by the observer is $$f1$$. If the train’s speed is reduced to $$17$$ $$m/s$$, the frequency registered is $$f2$$. If the speed of sound is $$340$$ $$m/s$$ then the ratio $$f1/f2$$ is

Infinity Learn · Accepted Answer

By using n'$$=n$$  vv−vS⇒$$f1=n$$ vv−$$vS=n$$ $$340340$$−$$34=340306nand$$ $$f2=n$$ $$340340$$−$$17=n$$ $$340323$$⇒$$f1f2=323306=1918$$

A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f₁. If the train’s speed is reduced to 17 m/s, the frequency registered is f₂. If the speed of sound is 340 m/s then the ratio $f_{1} / f_{2}$ is

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A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train’s speed is reduced to 17 m/s, the frequency registered is f2. If the speed of sound is 340 m/s then the ratio f1/f2 is

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A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f₁. If the train’s speed is reduced to 17 m/s, the frequency registered is f₂. If the speed of sound is 340 m/s then the ratio $f_{1} / f_{2}$ is