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Q.

The value of Planck's constant is $6.63 \times 10^{- 34} J s .$ The velocity of light is $3 \times 10^{8} m / \sec .$ Which value is closest to the wavelength of a quantum of light with frequency of $8 \times 10^{15} \sec^{- 1} ?$

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a

$5 \times 10^{- 18} m$

b

$4 \times 10^{- 8} m$

c

$3 \times 10^{7} m$

d

$2 \times 10^{- 25} m$

answer is B.

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Detailed Solution

$λ = \frac{c}{ν} = \frac{3 \times 10^{8}}{8 \times 10^{15}} = 3 .75 \times 10^{- 8} m$

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