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JAMB Physics 1999 Question 21

Question 21

Sound

If a sound wave goes from a cold-air region to a hot-air region, its wavelength will

  1. A.increase
  2. B.decrease
  3. C.decrease then increase
  4. D.remain constant.
Show the answer and explanation

Answer: A (increase)

Explanation

Sound travels faster in hot air while the frequency stays the same, so λ = v/f increases.