MHz

1.0 x 10^6 aches = 1.0 Megahurts.

The frequency of a sound wave is measured in waves per second. This unit per second is called Hertz (Hz). MHz is the abbriviation for Megahertz in the metric system. The prefix Mega stands for one million, so 1 MHz is equal to one million hertz, or one million waves per second.

In laymans terms, how high or low a sound is called it's frequency. It is measured by taking the amount of waves during one second. If there are a million waves per second, it is called 1 Megahertz, or 1 MHz.

The signal in a telephone line is a wave with a frequency in the MHz range.

The sound we can hear, though, is only measured in Hz.