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Q.

Number of photons of light with a length of 4000 pm necessary to provide one joule of energy approximately $x \times 10^{16}$ . Then x is-------.

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answer is 2.

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Detailed Solution

Number of photons $= \frac{\frac{E}{ℏ C}}{λ}$

$\frac{1}{= \frac{6.625 \times 10^{- 34} \times 3 \times 10^{8}}{4000 \times 10^{- 12}}}$

$= \frac{10^{17}}{5}$

$= 2 \times 10^{16}$

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Number of photons of light with a length of 4000 pm necessary to provide one joule of energy approximately x×1016 . Then x is-------.