passwella.
Menu

JAMB Physics 1995 Question 28

Question 28

Waves

The wavelength of signals from a radio transmitter is 1500 m and the frequency is 200 kHz. What is the wavelength for a transmitter operating at 1000 kHz?

  1. A.7500 m
  2. B.300 m
  3. C.75 m
  4. D.15 m
Show the answer and explanation

Answer: B (300 m)

Explanation

Speed is the same: λ1f1 = λ2f2. 1500 × 200 = λ × 1000, so λ = 300 m.