If a wave gets refracted into a denser medium, then which of the following is true? (a) wavelength, speed and frequency decreases. (b) wavelength increases, speed decreases and frequency remains constant. (c) wavelength and speed decreases but frequency remains constant. (d) wavelength, speed and frequency increases.

Answer: (c). Frequency is fixed by the source, so it does not change on refraction. In a denser medium the wave speed decreases, and λ = v/n decreases with it. So the answer is (c) wavelength and speed decrease, frequency remains constant.

If a wave gets refracted into a denser medium, then which of the… | JEE Main 2022 (27 Jun, Shift 2)

Q23JEE Main 2022 · 27 JUN · SHIFT 2Easy

Wave Basics & Properties of Sound

If a wave gets refracted into a denser medium, then which of the following is true?

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Answer: (c)

Frequency is fixed by the source, so it does not change on refraction.
In a denser medium the wave speed decreases, and $\lambda = \frac{v}{n}$ decreases with it.
So the answer is (c) wavelength and speed decrease, frequency remains constant.

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