MHT CET 2025 Physics question

When source of sound moves towards a stationary observer, the apparent frequency heard by him

(A)increases and wavelength also increases
(B)increases while wavelength decreasesCorrect
(C)remains the same while wavelength decreases
(D)decreases and wavelength remains the same

Answer: (B)

Solution

For a source approaching a stationary observer the apparent frequency is , so the frequency heard increases. The speed of sound in the medium stays (set by the medium), so the wavelength reaching the observer is , i.e. the

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Question ID VK-100669