passwella.
Menu

JAMB Physics 2003 Question 15

Question 15

Sound

A tuning fork of frequency 340Hz is vibrated just above a cylindrical tube of height 1.2m. If water is slowly poured into the tube, at what maximum height will resonance occur? [speed of sound in air = 340ms−1]

  1. A.0.95 m
  2. B.0.60m
  3. C.0.50m
  4. D.0.45m
Show the answer and explanation

Answer: A (0.95 m)

Explanation

λ = 340/340 = 1 m. The shortest resonating air column is λ/4 = 0.25 m, so the water can rise to 1.2 − 0.25 = 0.95 m.