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JEE Main · 2022 · 27 Jun 2022 · Shift 2 · Waves & Sound

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If a wave gets refracted into a denser medium, then which of the following is true?
  1. (A)wavelength speed and frequency decreases.
  2. (B)wavelength increases, speed decreases and frequency remains constant.
  3. (C)wavelength and speed decreases but frequency remains constant.✓ Correct
  4. (D)wavelength, speed and frequency increases.

Answer: (C)

Solution

When a wave refracts from a rarer to a denser medium:
  1. Frequency remains constant: Frequency is determined by the source and does not change during refraction.
  1. Speed decreases: The wave speed in a denser medium is lower than in a rarer medium (, where for denser media).
  1. Wavelength decreases: Since and frequency is constant, when speed decreases, wavelength must also decrease proportionally.

Therefore, wavelength and speed decrease but frequency remains constant.

JEE Main · 2022 · 27 Jun 2022 · Shift 2 · Single correct option

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