The value of Planck's constant is 6.63×10−34Js. The speed of light 3×1017nms−1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6×1015s−1?
10
25
50
75
A
25
B
10
C
50
D
75
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Solution
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v=cλ ∴λ=3×1017nms−16×1015s−1=50nm
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