Light from a red laser pointer has a speed of 3.0×108 m/s and has a wavelength of 6.5×10−7 m . what is the frequency of this light?

Explanation:

We have equation for speed of electromagnetic wave,

               c = fλ

Where

           f is the frequency and λ is the wavelength.

Here

            c = 3.0×10⁸ m/s

            λ = 6.5×10⁻⁷ m

Substituting in c = fλ

              3.0×10⁸ = f x 6.5×10⁻⁷

               f = 4.61 x 10¹⁴ Hz

The frequency of this light is 4.61 x 10¹⁴ Hz

the answer is kevlar

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