Wave Speed

Wave speed is given in meters per second (the number of waves that pass per second). Wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per second.

Half Life

The radioactivity of a sample decreases over time. Half life is a measurement of this decrease.


The efficiency of a device is the proportion of input energy that is converted to useful energy.


transformer is an piece of electrical apparatus which will increase or decrease the voltage in an alternating current. It can be designed to "step up" or "step down" voltages and is based on the magnetic induction principle.

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