A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is . If the speed of the train is reduced to 17 m/s, the frequency registered is . If the speed of sound is 340 m/s, then the ratio is :
Frequency of sound when observer is stationary and source is moving towards observer -
- wherein
speed of sound
speed of source
original frequency
apparent frequency
from (1) and (2)
Option 4)
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