The wavelength of violet light is about 425 nm (1 nanometer = 1 × 10−9 m). what are the frequency and period of the light waves?

1) Frequency:

The frequency of electromagnetic radiation is given by:

where

is the speed of light

is the wavelength

In this case, the wavelength of the radiation is

Therefore the frequency is

2) Period:

The period is equal to the reciprocal of the frequency of the wave:

Using the frequency we found previously, , we find:

option number c is the right answer.

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