SATHEE: Structure of Atom - Result Question 3

Structure of Atom - Result Question 3

####3. The value of Planck’s constant is $6.63 \times 10^{- 34} J s$ . The speed of light is $3 \times 10^{17} n m s^{- 1}$ . Which value is closest to the wavelength in nanometer of a quantum of light with frequency of $6 \times 10^{15} s^{- 1}$ ?

[NEET 2013]

(a) 25

(b) 50

(c) 75

(d) 10

Show Answer

Solution:

(b) $c = 0 λ$

$λ = \frac{c}{v} = \frac{3 \times 10^{17}}{6 \times 10^{15}} = 50 n m$

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