Question

A loudspeaker produces sound waves that change in wavelength from 1.0 m to 1.5 m. If the wave speed is constant, how did the vibration of the loudspeaker change. Explain.

Answer 1

Answer:

The only possible explanation is that the frequency of the emitted wave has changed.

In fact, wavelength  is related to the frequency f by:

lambda= v/f

where v is the speed of the wave. If v is constant and the wavelength has changed, then it means that f, the frequency, has also changed.

Answer 2

The emmited wave frequency has changed is the only possible thing