The energy of a photon of radiation having wavelength $300 n m$ is:

6.63 \times 10^{- 29} J

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6.63 \times 10^{- 19} J

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6.63 \times 10^{- 28} J

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6.63 \times 10^{- 17} J

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Solution

The correct option is B $6.63 \times 10^{- 19} J$
$E = \frac{h c}{λ} = \frac{6.626 \times 10^{- 34} \times 3 \times 10^{8}}{300 \times 10^{- 9}} = 6.63 \times 10^{- 19} J$ .

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