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JAMB Physics 2009 Question 28

Question 28

Sound

Metal cables are used as telephone wires because

  1. A.they are cheap.
  2. B.they are sourced locally.
  3. C.the speed of sound in them is very low.
  4. D.the speed of sound in them is very high
Show the answer and explanation

Answer: D (the speed of sound in them is very high)

Explanation

Sound (and signals) travel very fast in metals, much faster than in air, so metal wires carry messages quickly.