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If the wavelength of light is `4000 Å`, then the number of waves in `1 mm` length will be

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If the wavelength of light is `4000 Å`, then the number of waves in `1 mm` length will be
A. 25
B. 0.25
C. `0.25 xx 10^(4)`
D. `25 xx 10^(4)`
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Correct Answer - C
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