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Q.

The value of Planck’s constant is 6.63×10-34J-s.  The speed of light is 3×1017nms-1.  Which value is closest to the wavelength in nanometers of a quantum of light with frequency of  6×1015s-1?

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a

10

b

25

c

50

d

75

answer is C.

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Detailed Solution

c=vλ   λ=cv=3×1017nms−16×1015s−1=50nm

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