A wave length of 400 nm of an electromagnetic radiation does not correspond to :

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frequency = 7.5 × 1014 Hz

wave number = 2.5 × 106 m-1

velocity = 3 × 108 ms-1

wavelength= 40 A0

answer is D.

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Detailed Solution

(1) ν=Cλ=3×108400×10−9=7.5×1014Hz(2) v¯=1λ=1400×10−9=2.5×106ms−1(3) Velocity = Speed of light.(4) λ=4000 A0

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