Q 1671701626.     If the wavelength of red light in air is `7500 \overset{o}{A}`, then the frequency of light in air is ___________.

MHCET 2013
A

`7.5\times 10^{10}Hz`

B

`3\times 10^{14}Hz`

C

`4\times 10^{14}Hz`

D

`5\times 10^{14}Hz`

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