1. Tardigrade
  2. Question
  3. Physics
  4. A whistle sends out 256 waves in a second. If the whistle approaches the observer with velocity 1 / 3 of the velocity of sound in air, Find the number of waves per second the observer.

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Q. A whistle sends out $256$ waves in a second. If the whistle approaches the observer with velocity $1 / 3$ of the velocity of sound in air, Find the number of waves per second the observer.

Waves

Solution:

$n'=\frac{v}{v-\frac{1}{3} v} n=\frac{3}{2} n=384$