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NTA Abhyas JEE Main2020PhysicsWaves and SoundPractice

There are two waves having wavelength 100 cm and 101 cm and same velocity 303 m s - 1 . The beat frequency is

Options

  1. A4     Hz
  2. B1     Hz
  3. C3 Hz
  4. D2     Hz

Correct answer

C. 3 Hz

Step-by-step solution

If f 1 and f 2 are the frequencies ( f 1 > f 2 ) of the two waves, then the beat frequency f b = f 1 - f 2 Frequency of 1 s t wave, f 1 = V 1 λ 1 = 303 100 × 10 2 = 3.03 × 10 2 H z For 2 n d wave, f 2 = V 1 λ 2 = 303 101 × 10 2 = 3 × 10 2 H z So, beat frequency = f 1 - f 2 = 3.03 × 10 2 - 3 × 10 2 = . 03 × 10 2 = 3 H z

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