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JAMB Physics 2024 Question 16

Question 16

Sound

In a resonance tube experiment as shown in the diagram, the frequency of the tuning fork is 750Hz and the resonating length of the air column is 0.3m as shown. The velocity of the wave is

Diagram for this question
  1. A.1,850ms−1
  2. B.225ms−1
  3. C.300ms−1
  4. D.2,500ms−1
Show the answer and explanation

Answer: C (300ms−1)

Explanation

The diagram shows an antinode at the top, a node, an antinode and a node at the water: three quarter-wavelengths. 3λ/4 = 0.3 m, so λ = 0.4 m and v = fλ = 750 × 0.4 = 300 m s−1.