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JAMB Physics 1978 Question 39

Question 39

Waves

A guitar string is 75 cm long. The wavelength of its fundamental note is

  1. A.75 cm
  2. B.150 cm
  3. C.37.5 cm
  4. D.112.5 cm
  5. E.50 cm.
Show the answer and explanation

Answer: B (150 cm)

Explanation

In the fundamental mode the string is half a wavelength long: λ/2 = 75 cm, so λ = 150 cm.