Question

Example 14-11 depicts the following scenario. A train sounds its whistle as it approaches a tunnel in a cliff. The whistle produces a tone of 650.0 HzHz, and the train travels with a speed of 21.2 m/sm/s.

Now we will consider some slightly different scenarios related to Example 14-11.

A)Suppose the engineer adjusts the speed of the train until the sound he hears reflected from the cliff is 770 HzHz . The train's whistle still produces a tone of 650.0 HzHz. Is the new speed of the train greater than, less than, or equal to 21.2 m/sm/s? Explain

C)Now refer back to Example 14-11. Suppose the train is backing away from the cliff with a speed of 18.5 m/sm/s and is sounding its 650.0 HzHz whistle. What is the frequency heard by the observer standing near the tunnel entrance?

D)What is the frequency heard by the engineer in part C?

Express your answer using three significant figures.

Answer 1

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