Question

What units are used to describe frequency, or vibrations per second?

meters
decibels
pitch
hertz

Answer 1

hertz

Step-by-step explanation:

Usually frequency is measured in the hertz unit, named in honor of the 19th-century German physicist Heinrich Rudolf Hertz. The hertz measurement, abbreviated Hz, is the number of waves that pass by per second. For example, an "A" note on a violin string vibrates at about 440 Hz (440 vibrations per second).