Question

An electromagnetic radio wave is received by a transmitter before it is converted to a sound wave. The radio wave has a wavelength of 23,076 m and a frequency of 13,000 Hz. What velocity is the wave traveling at before the transmitter converts it to a sound wave?

1.76 m/s
0.56 m/s
3.31 × 102 m/s
3.00 × 108 m/s

Answer 1

v = fλ = (13,000 s⁻¹)(23,076 m) = 2.99988×10^8 m/s ≈ 3.00×10^8 m/s.