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SAT® Subject Test in Physics

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Frequency of Purple Light

SATPHY-GEQ1KN

A certain color of light towards the purple end of the visible spectrum has a wavelength of $420\ nm$ in a vacuum.

What is the frequency of this light?

The speed of light in a vacuum is $\text{3.00 x 10 8m/s}$.

A

$ 126\ Hz $​

B

$ 1.26\times { 10 }^{ 11 }\ Hz $

C

$ 7.1\times { 10 }^{ 14 }\ Hz $

D

$ 1.4\times { 10 }^{ -15 }\ Hz $

E

$ 1.4\times { 10 }^{ -6 }\ Hz $