A passenger is sitting in a train which is moving fast. The engine of the train blows a whistle of frequency '$$n$$'. If the apparent frequency of sound heard by the passenger is '$$f$$' then
- A$$\mathrm{f}=\mathrm{n}$$
- B$$\mathrm{f}>\mathrm{n}$$
- C$$\mathrm{f < n}$$
- D$$\mathrm{f \le n}$$
✓ Correct answer: A
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