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A source of sound of frequency 500 hz is moving towards an observer with velocity 30 m/s. The speed of sound is 330 m/s. The frequency heard by the observer will be
  • a)
    545 hz
  • b)
    580 hz
  • c)
    458.3 hz
  • d)
    550 hz
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A source of sound of frequency 500 hz is moving towards an observer wi...
While solving problems involving Doppler effect the direction along the line joining source and observer is taken positive for determining the sign of the velocities of the source and observer. 
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Community Answer
A source of sound of frequency 500 hz is moving towards an observer wi...
Given:
Frequency of sound, f = 500 Hz
Velocity of the source, v = 30 m/s
Velocity of sound, c = 330 m/s

To find:
Frequency heard by the observer, f'

Formula used:
f' = f [(c + v) / c]

Calculation:
f' = 500 [(330 + 30) / 330]
f' = 550 Hz

Therefore, the frequency heard by the observer will be 550 Hz.
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