1)

**Wavelength**is the distance between repeating units of a propagating wave of a given frequency. Designated by the Greek letter lambda (λ).

2)

**Frequency**is the measurement of the number of occurrences of a repeated event per unit of time. It is also defined as the rate of change of phase of a sinusoidal waveform. (To calculate the frequency of the event, the number of occurrences of the event within a fixed time interval are counted, and then divided by the length of the time interval.)

Wavelength range:

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