Question

1. ______ is the rate at which something repeats over a set period, such as the number of waves per second in physics. 16. a series of events that are regularly repeated in the same order is a ____. 17. the si unit of frequency, equal to one cycle per second is ____. 18. what makes sounds louder? ______

Explanation:

1. Frequency is defined as the rate of repetition over a set - period. In physics, for waves, it's the number of waves per second.
2. A series of regularly - repeated events in the same order is called a periodic event or a periodic phenomenon.
3. The SI unit of frequency is the hertz (Hz), which is equal to one cycle per second.
4. Amplitude makes sounds louder. Amplitude is the maximum displacement of a wave from its equilibrium position, and in the case of sound waves, a larger amplitude corresponds to a louder sound.

Answer:

1. Frequency
2. Periodic event
3. Hertz (Hz)
4. Amplitude