When a train is approaching the stationary observer, the apparent frequency of the whistle of the train is \(n_1\) and when the train is moving away from the observer, the apparent frequency is \(n_2\). The frequency of the whistle noticed by the observer when he moves with the train is _________ .

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.