The unit commonly used to express how often a wave occurs per second.

The unit commonly used to express how often a wave occurs per second.

• A. Joule
• B. Watt
• C. Hertz
• D. Newton

Answer: (C)

Frequency is how often something happens in a given time, and for waves that means how many cycles occur each second. The unit used to express this is the hertz, with 1 Hz equal to 1 cycle per second. Other units like joule (energy), watt (power), and newton (force) describe different quantities, so they don’t measure how often a wave occurs. So the unit for how often a wave occurs per second is hertz (Hz). For example, a wave repeating 60 times each second has a frequency of 60 Hz.

Frequency is how often something happens in a given time, and for waves that means how many cycles occur each second. The unit used to express this is the hertz, with 1 Hz equal to 1 cycle per second. Other units like joule (energy), watt (power), and newton (force) describe different quantities, so they don’t measure how often a wave occurs. So the unit for how often a wave occurs per second is hertz (Hz). For example, a wave repeating 60 times each second has a frequency of 60 Hz.