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Question

A certain color of light towards the purple end of the visible spectrum has a wave length of 420nm in vacuum.
What is the frequency of this light? (The speed of light in a vacuum is 3.00×108m/s).

A
126Hz
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B
1.26×1011Hz
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C
7.1×1014Hz
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D
1.4×1015Hz
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E
1.4×106Hz
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