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(B) The energy of a single photon is given by $E = h 
u$. Given: $h = 6.62 	imes 10^{-34} \ J \ s$ and $
u = 5 	imes 10^{10} \ s^{-1}$. Energy of

Vedclass · Accepted Answer

$3.98 	imes 10^{1} \ J$

Vedclass · Answer

(B) The energy of a single photon is given by $E = h 
u$. Given: $h = 6.62 	imes 10^{-34} \ J \ s$ and $
u = 5 	imes 10^{10} \ s^{-1}$. Energy of one photon $= (6.62 	imes 10^{-34}) 	imes (5 	imes 10^{10}) = 33.1 	imes 10^{-24} \ J = 3.31 	imes 10^{-23} \ J$. Energy of $1$ mole of photons $= N_A 	imes E = (6.022 	imes 10^{23}) 	imes (3.31 	imes 10^{-23} \ J) \approx 19.93 \ 	ext{J}$. Thus,the energy is approximately $19.9 \ 	ext{J}$.

Find the energy of $1$ mole of photons having a frequency of $5 \times 10^{10} \ s^{-1}$. $(h = 6.62 \times 10^{-34} \ J \ s)$

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