Waves - Result Question 77

79. A source and an observer move away from each other, with a velocity of 10m/s with respect to ground. If the observer finds the frequency of sound coming from the source as 1950Hz, then original frequency of source is (velocity of sound in air =340m/s )

(a) 1950Hz

(b) 2068Hz

(c) 2132Hz

(d) 2486Hz

[2001]

Show Answer

Answer:

Correct Answer: 79. (b)

Solution:

  1. (b) According to Doppler’s effect

n=(vv0vvs)n=(34010340+10)n=330350×1950

=068Hz



NCERT Chapter Video Solution

Dual Pane