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Question

The value of Planck's constant is 6.6310^-34J-s. The velocity of light is 310⁸ m/sec. Which value is closest to the wavelength in nanometre of a quantum of lighr with frequency of 810¹⁵ /sec.

A.510^-18

^B.410

^C.310^{^7}

^{D.2*10^-25}

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Solution

Velocity = wavelength * frequency

lambda = velocity / frequency

3 * 10^8 / 8 * 10^15

0.375 * 10^ (-7) m

= 37.5 nm(nanometer)

So correct option is (B)

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