What quantity measures the number of complete wavelengths passing a fixed point per unit time?

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Multiple Choice

What quantity measures the number of complete wavelengths passing a fixed point per unit time?

Explanation:
Frequency measures how many complete wavelengths pass a fixed point per unit time. Each complete wavelength corresponds to one cycle of the wave, so the faster the cycles pass a point, the higher the frequency. Its unit is hertz (cycles per second). This is different from the other quantities: period is the time for one cycle, wavelength is the spatial length of one cycle, and amplitude is the height of the wave. The relation v = fλ shows frequency as the rate at which cycles occur, tying together speed and wavelength.

Frequency measures how many complete wavelengths pass a fixed point per unit time. Each complete wavelength corresponds to one cycle of the wave, so the faster the cycles pass a point, the higher the frequency. Its unit is hertz (cycles per second). This is different from the other quantities: period is the time for one cycle, wavelength is the spatial length of one cycle, and amplitude is the height of the wave. The relation v = fλ shows frequency as the rate at which cycles occur, tying together speed and wavelength.

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