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JAMB Physics 1978 Question 40

Question 40

Sound

Two boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels

  1. A.mainly through air
  2. B.fainter in stretched string
  3. C.faster through gases than in solids and liquids
  4. D.with greater ease through a string than in air
  5. E.none of the above is correct.
Show the answer and explanation

Answer: D (with greater ease through a string than in air)

Explanation

The taut string carries the sound vibrations from one can to the other much better than the open air would.