What is frequency?

What is frequency?

• A. The number of waves per second
• B. The speed of the wave
• C. The color of the wave
• D. The duration of the sound

Answer: (A)

Frequency is the rate at which the waves repeat, meaning how many complete wave cycles pass a fixed point each second. It’s measured in hertz (Hz). For example, if five crests pass a point every second, the frequency is 5 Hz. This tells you how often the wave occurs, not how fast it moves (that’s the wave’s speed) or what color the light is (for light, color is related to frequency but is a perceptual label, not the quantity itself). It also isn’t the duration or length of a single pulse. The relationship v = fλ shows how frequency connects with speed and wavelength: for a given medium, higher frequency corresponds to shorter wavelength.

Frequency is the rate at which the waves repeat, meaning how many complete wave cycles pass a fixed point each second. It’s measured in hertz (Hz). For example, if five crests pass a point every second, the frequency is 5 Hz. This tells you how often the wave occurs, not how fast it moves (that’s the wave’s speed) or what color the light is (for light, color is related to frequency but is a perceptual label, not the quantity itself). It also isn’t the duration or length of a single pulse. The relationship v = fλ shows how frequency connects with speed and wavelength: for a given medium, higher frequency corresponds to shorter wavelength.