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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

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