When a sound wave passes from air into water, the

JAMB Physics 2023 203 views
Source: JAMB · 2023

When a sound wave passes from air into water, the

  1. speed and wavelength decrease but its frequency remain the same
  2. speed and frequency increase but its wavelength remain the same
  3. speed remain the same but its wavelength and frequency increase
  4. speed and wavelength increase but its frequency remain the same ✓
Explanation

Frequency is fixed by the source, so it does not change when sound enters a new medium.

Sound travels faster in water (about 1500 m/s) than in air (about 340 m/s). Since v = fλ and f is constant, the wavelength also increases. So speed and wavelength increase but frequency stays the same.

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