Suppose a physics student is standing by the railroad tracks. As a train approac

Question

Suppose a physics student is standing by the railroad tracks. As a train approaches, the student observes the train whistle to have a frequency of 442 Hz, and 441 Hz as the train recedes from him. His friend, who is on board the train, would measure the whistle frequency to be (Which answer is correct?): a.) 442 Hz while approaching the physics student on the ground and 441 Hz while receding from the physics student on the ground b.) constant with a value between 441 Hz and 442 Hz c.) 441 Hz while approaching the physics student on the ground and 442 Hz while receding from the physics student on the ground d.) constant but smaller than 441 Hz e.) constant but larger than 441 Hz

Explanation / Answer

c

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