Question

what is the amplitude of a wave?
a how fast the waves are going
b how many waves pass by in a second
c how long a wave is
d the height of a wave

Explanation:

• Option a: "How fast the waves are going" describes wave speed, not amplitude.
• Option b: "How many waves pass by in a second" is frequency, not amplitude.
• Option c: "How long a wave is" refers to wavelength, not amplitude.
• Option d: Amplitude of a wave is defined as the maximum displacement of a point on the wave from its rest position, which can be thought of as the height of the wave (from the midline to the peak or trough).

Answer:

d. the height of a wave