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JIPMER2016PhysicsWaves and Sound

A bat emitting an ultrasonic wave of frequency 4.5 10^4 ~Hz at speed of 6 ~m / s between two parallel walls. The two frequencies heared by the bat will be

Options

  1. A4.67 10^4 ~Hz , 4.34 10^4 ~Hz
  2. B4.34 10^4 ~Hz , 4.67 10^4 ~Hz
  3. C4.5 10^4 ~Hz , 5.4 10^4 ~Hz
  4. D4.67 10^3 ~Hz , 4.34 10^4 ~Hz

Correct answer

B. 4.34 10^4 ~Hz , 4.67 10^4 ~Hz

Step-by-step solution

Frequency received by bat after reflection from wall (1). aligned t₂ & =f [ v-u v+u ] & =4.5 10^4 [ 330-6 300+6 ] & =4.34 10^4 ~Hz aligned

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