What is the unit used to measure waves?

What is the unit used to measure waves?

• A. Hertz
• B. Meter
• C. Ampere
• D. Candela

Answer: (A)

The main idea is frequency—the rate at which a wave repeats over time. The unit Hertz (Hz) represents one cycle per second, so saying a wave has a frequency of 5 Hz means five crests pass a fixed point each second. That makes Hz the natural unit for describing waves, since it directly quantifies how often the wave occurs. Meter would describe distance, such as wavelength, not how often the wave repeats; ampere is electric current, and candela is brightness, neither of which measure how waves occur over time. For light and other waves, the frequency can be very high, but the unit Hz (or its multiples) still applies.

The main idea is frequency—the rate at which a wave repeats over time. The unit Hertz (Hz) represents one cycle per second, so saying a wave has a frequency of 5 Hz means five crests pass a fixed point each second. That makes Hz the natural unit for describing waves, since it directly quantifies how often the wave occurs. Meter would describe distance, such as wavelength, not how often the wave repeats; ampere is electric current, and candela is brightness, neither of which measure how waves occur over time. For light and other waves, the frequency can be very high, but the unit Hz (or its multiples) still applies.