What will be the percentage differene between the frequency of the sound heard by an oberver and the actual frequency of the sound heard by an an observer and the actual frequency of the whistle of a train approaching at a speed of 100 ms^(-1) towards the observer? Velocity of sound in air=330 ms^(-1)

What will be the percentage differene between the frequency of the sou

1.	What will be the percentage differene between the frequency of the sound heard by an oberver and the actual frequency of the sound heard by an an observer and the actual frequency of the whistle of a train approaching at a speed of 100 ms^(-1) towards the observer? Velocity of sound in air=330 ms^(-1)
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