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Q.

The value of Planck constant is  6.63×10−34Js he velocity of light is  3.0×107m s−1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of  8×1015s−1   

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a

4×101

b

3×107

c

2×10−25

d

5×10−18

answer is A.

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Detailed Solution

v=c/λ=3×1088×1015=37.5×109m

=37.5 nm≈4×101nm

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