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(B) The power delivered by the reactor is $P = 300\, MW = 300 	imes 10^6\, J/s$.The energy released per fission is $E = 170\, MeV = 170 	imes 10^6 \

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$4 	imes 10^{22}$

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(B) The power delivered by the reactor is $P = 300\, MW = 300 	imes 10^6\, J/s$.The energy released per fission is $E = 170\, MeV = 170 	imes 10^6 	imes 1.6 	imes 10^{-19}\, J = 2.72 	imes 10^{-11}\, J$.The power is given by $P = \frac{n E}{t}$, where $n$ is the number of atoms fissioned in time $t$.For $t = 1\, s$, the number of atoms fissioned per second is $n_s = \frac{P}{E} = \frac{300 	imes 10^6}{2.72 	imes 10^{-11}} \approx 1.103 	imes 10^{19}\, 	ext{atoms/s}$.The number of atoms fissioned per hour is $n_h = n_s 	imes 3600\, s = 1.103 	imes 10^{19} 	imes 3600 \approx 3.97 	imes 10^{22} \approx 4 	imes 10^{22}$ atoms.

An atomic power nuclear reactor can deliver $300\, MW$. The energy released due to fission of each nucleus of uranium atom $^{235}U$ is $170\, MeV$. The number of uranium atoms fissioned per hour will be

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