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The value of Planck's constant is 6.63x 10-34Js. The velocity of light is 3.0x 108ms-1 . Which value is closest to the wavelength in nanometres of a quantum of light with frequency of 8x10 15 s-1:
(1) 3x 107
(2) 2x 10 -25
(3) 5x 10 -18
(4) 4x 10 1
Ans: 4x 10 1
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