The value of Planck's constant is 6.63 10^ -34 J s. The speed of … - Vidyadip

MCQ

The value of Planck's constant is $6.63 \times 10^{-34} \ J \ s.$ The speed of light is $3 \times 10^{17}\, nm\, s ^{-1}.$ Which value is closest to the wavelength in nanometer of a quantum of light with frequency of $6 \times 10^{18} s^{-1} $ ?

✓
$50$
B
$75$
C
$10$
D
$25$

✓

Answer

Correct option: A.

$50$

a
$\lambda=\frac{C}{V}=\frac{3 \times 10^{17} n m{s}^{-1}}{6 \times 10^{13} s^{-1}}=50 n m$

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