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KCET 2020 Physics Solved Paper
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Question : 40
Total: 60
A train whistling at constant frequency ‘n’ is moving towards a station at a constant speed V.
The train goes past a stationary observer on the station. The frequency ‘n’ of the sound as heard by the observer is plotted as a function of time ‘t’. Identify the correct curve
Validate
Solution:
As the train approaches the observer the apparent frequency is higher than the actual frequency. As the train moves away from the observer, the apparent frequency is lower than the actual frequency. Hence the correct option is (a).
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