When a train is approaching the stationary observer, the apparent frequency of the whistle of the train is n₁ and when the train is moving away from the observer, the apparent frequency is n₂ . The frequency of the whistle noticed by the ob

Question

When a train is approaching the stationary observer, the apparent frequency of the whistle of the train is n₁ and when the train is moving away from the observer, the apparent frequency is n₂ . The frequency of the whistle noticed by the observer when he moves with the train is _________ .

Quantrex Academy · Accepted Answer

Correct answer: A. 2 n₁ n₂ n₁+n₂

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When a train is approaching the stationary observer, the apparent frequency of the whistle of the train is n₁ and when the train is moving away from the observer, the apparent frequency is n₂ . The frequency of the whistle noticed by the observer when he moves with the train is _________ .

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