Answer
This is a writing exercise for the student, and answers will vary.
Work Step by Step
Sample:
For a traveling wave, when the frequency of the wave is increased, which of the following always happens?
a. the wave speed increases
b. the wavelength increases
c. Both A and B always happen
d. Neither A nor B happens
The answer is D.
The wave speed v doesn't change. The wave speed is frequency multiplied by wavelength.
$$v = f \lambda $$
If the frequency is increased, the wavelength doesn't increase: in fact, it decreases. Their product, $f \lambda $, remains the same because the wave speed doesn't change.
