Wave Motion 4 Question 15

14. A whistle giving out 450Hz approaches a stationary observer at a speed of 33m/s. The frequency heard by the observer (in Hz) is (Speed of sound =330m/s)(1997,1M)

(a) 409

(b) 429

(c) 517

(d) 500

Objective Questions II (One or more correct option)

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Answer:

Correct Answer: 14. (c)

Solution:

  1. Source is moving towards the observer

f=f(vvvs)=450(33033033)f=500Hz



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