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Q.

Calculate the energy in joule corresponding to light of wavelength 45 nm. (Planck's constant, h = 6.63 × 10-34 Js , speed of light, c = 3 ×108 ms-1)

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a

6.67×1015

b

6.67×1011

c

4.42×10-15

d

4.42×10-18

answer is D.

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Detailed Solution

E=hcλ  Given, λ=45nm=45×10-9 mOn putting the given values in the equation, we get E=6.63×10-34×3×10845×10-9=4.42×10-18 J
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