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The value of ...

Question

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

10

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25

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50

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75

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Solution

The correct option is C $50$
$v = \frac{c}{λ}$
$∴ λ = \frac{3 \times 10^{17} n m s^{- 1}}{6 \times 10^{15} s^{- 1}} = 50 n m$

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6.63 \times 10^{- 34} J s

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^{- 1}

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The value of Plank's constant is 6.63 × 10^-34 Js. The speed of light is 3×10¹⁷ nm s^-1. Which value is closest with frequency of 6×10¹⁵ s^-1 ?

6.63 \times 10^{- 34} J s .

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6.63 \times 10^{- 34} j s

3.0 \times 10^{8} m s^{- 1}

8 \times 10^{15} s^{- 1}

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