JAMB Physics 2020 Objective — Question 39

Question 39 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.

39. When a sound wave passes from air into water, its

A. A. speed and frequency increase but wavelength remains the same
B. B. speed and wavelength increase but frequency remains the sameCorrect
C. C. speed remains the same but wavelength and frequency increase
D. D. speed decreases while wavelength and frequency increase

Explanation

When sound passes from air to water, only the speed and wavelength change (both increase); the frequency remains the same since it is determined by the source.

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