**Q: **Is frequency the number of occurrences of a repeating event per unit time? ¶

**A: **Yes.

**Q: **Are frequencies usually measured with a frequency counter? ¶

**A: **Yes.

**Q: **Is frequency the property of sound that most determines pitch? ¶

**A: **Yes.

**Q: **Is frequency analogous to temporal frequency? ¶

**A: **Yes, but the time axis is replaced by one or more spatial displacement axes.

**Q: **Is frequency commonly measured in radians per second but? ¶

**A: **Yes, for discrete-time signals, can also be expressed as radians per sample time, which is a dimensionless quantity.

**Q: **Is frequency the hertz , named after the German physicist Heinrich Hertz? ¶

**A: **Yes, one hertz means that an event repeats once per second.

**Q: **Is frequency mixed with the unknown frequency in a nonlinear mixing device such as a diode? ¶

**A: **Yes.

**Q: **Is frequency an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena? ¶

**A: **Yes, such as mechanical vibrations, audio signals, radio waves, and light.

**Q: **Is frequency defined as a number of cycles per unit time? ¶

**A: **Yes.