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PHXII13:NUCLEI

363730 Assuming that about $200 M e V$ of energy is released per fission of $_{92} U^{235}$ nuclei, then the mass of $U^{235}$ consumed per day in a fission reactor of power 1 megawatt will be approximately:

1

10, 000 g

2

10^{- 2} g

3

1 g

4

100 g

Explanation:

Power $P$ of fission reaction,
$P = 10^{6} w a t t = 10^{6} j o u l e / s e c$
Time $= t = 1 d a y = 24 \times 3600 \sec$
Energy produced , $U = P t$
$U = 10^{6} \times 24 \times 3600 = 24 \times 36 \times 10^{8} j o u l e$
Energy released per fission of $U^{235}$
$= 200 M e V = 32 \times 10^{- 12} J$
Number of $U^{235}$ atoms used
$= \frac{24 \times 36 \times 10^{8}}{32 \times 10^{- 12}} = 27 \times 10^{20}$
Mass of $6 \times 10^{23}$ atoms of $U^{235} = 235 g$
Mass of $27 \times 10^{20}$ atoms of $U^{235}$
$= (\frac{235}{6 \times 10^{23}}) (27 \times 10^{20}) = 1 g$

PHXII13:NUCLEI

363731 Assertion :
There is a chain reaction when uranium is bombarded with slow neutrons.
Reason :
When uranium is bombarded with slow neutrons more neutrons are produced.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

Slow neutron bombardment of $^{235} U$ initiates a chain reaction, yielding products like $^{141} B a,^{92} K r$ , and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).

PHXII13:NUCLEI

363732 Assertion :
For the fission of heavy nuclei, neutrons are more effective than protons.
Reason :
Protons are heavier than Neutrons.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$m_{n} = 1 a m u, m_{p} = 0.938 a m u$ . A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).

PHXII13:NUCLEI

363733 A chain reaction in fission of Uranium is possible because

1 Large amount of energy is released

2 Two intermediate size nuclear fragments are formed

3 More than one neutron is given out in each fission

4 Fragments in fission are radioactive

PHXII13:NUCLEI

363730 Assuming that about $200 M e V$ of energy is released per fission of $_{92} U^{235}$ nuclei, then the mass of $U^{235}$ consumed per day in a fission reactor of power 1 megawatt will be approximately:

1

10, 000 g

2

10^{- 2} g

3

1 g

4

100 g

Explanation:

Power $P$ of fission reaction,
$P = 10^{6} w a t t = 10^{6} j o u l e / s e c$
Time $= t = 1 d a y = 24 \times 3600 \sec$
Energy produced , $U = P t$
$U = 10^{6} \times 24 \times 3600 = 24 \times 36 \times 10^{8} j o u l e$
Energy released per fission of $U^{235}$
$= 200 M e V = 32 \times 10^{- 12} J$
Number of $U^{235}$ atoms used
$= \frac{24 \times 36 \times 10^{8}}{32 \times 10^{- 12}} = 27 \times 10^{20}$
Mass of $6 \times 10^{23}$ atoms of $U^{235} = 235 g$
Mass of $27 \times 10^{20}$ atoms of $U^{235}$
$= (\frac{235}{6 \times 10^{23}}) (27 \times 10^{20}) = 1 g$

PHXII13:NUCLEI

363731 Assertion :
There is a chain reaction when uranium is bombarded with slow neutrons.
Reason :
When uranium is bombarded with slow neutrons more neutrons are produced.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

Slow neutron bombardment of $^{235} U$ initiates a chain reaction, yielding products like $^{141} B a,^{92} K r$ , and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).

PHXII13:NUCLEI

363732 Assertion :
For the fission of heavy nuclei, neutrons are more effective than protons.
Reason :
Protons are heavier than Neutrons.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$m_{n} = 1 a m u, m_{p} = 0.938 a m u$ . A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).

PHXII13:NUCLEI

363733 A chain reaction in fission of Uranium is possible because

1 Large amount of energy is released

2 Two intermediate size nuclear fragments are formed

3 More than one neutron is given out in each fission

4 Fragments in fission are radioactive

PHXII13:NUCLEI

363730 Assuming that about $200 M e V$ of energy is released per fission of $_{92} U^{235}$ nuclei, then the mass of $U^{235}$ consumed per day in a fission reactor of power 1 megawatt will be approximately:

1

10, 000 g

2

10^{- 2} g

3

1 g

4

100 g

Explanation:

Power $P$ of fission reaction,
$P = 10^{6} w a t t = 10^{6} j o u l e / s e c$
Time $= t = 1 d a y = 24 \times 3600 \sec$
Energy produced , $U = P t$
$U = 10^{6} \times 24 \times 3600 = 24 \times 36 \times 10^{8} j o u l e$
Energy released per fission of $U^{235}$
$= 200 M e V = 32 \times 10^{- 12} J$
Number of $U^{235}$ atoms used
$= \frac{24 \times 36 \times 10^{8}}{32 \times 10^{- 12}} = 27 \times 10^{20}$
Mass of $6 \times 10^{23}$ atoms of $U^{235} = 235 g$
Mass of $27 \times 10^{20}$ atoms of $U^{235}$
$= (\frac{235}{6 \times 10^{23}}) (27 \times 10^{20}) = 1 g$

PHXII13:NUCLEI

363731 Assertion :
There is a chain reaction when uranium is bombarded with slow neutrons.
Reason :
When uranium is bombarded with slow neutrons more neutrons are produced.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

Slow neutron bombardment of $^{235} U$ initiates a chain reaction, yielding products like $^{141} B a,^{92} K r$ , and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).

PHXII13:NUCLEI

363732 Assertion :
For the fission of heavy nuclei, neutrons are more effective than protons.
Reason :
Protons are heavier than Neutrons.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$m_{n} = 1 a m u, m_{p} = 0.938 a m u$ . A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).

PHXII13:NUCLEI

363733 A chain reaction in fission of Uranium is possible because

1 Large amount of energy is released

2 Two intermediate size nuclear fragments are formed

3 More than one neutron is given out in each fission

4 Fragments in fission are radioactive

PHXII13:NUCLEI

363730 Assuming that about $200 M e V$ of energy is released per fission of $_{92} U^{235}$ nuclei, then the mass of $U^{235}$ consumed per day in a fission reactor of power 1 megawatt will be approximately:

1

10, 000 g

2

10^{- 2} g

3

1 g

4

100 g

Explanation:

Power $P$ of fission reaction,
$P = 10^{6} w a t t = 10^{6} j o u l e / s e c$
Time $= t = 1 d a y = 24 \times 3600 \sec$
Energy produced , $U = P t$
$U = 10^{6} \times 24 \times 3600 = 24 \times 36 \times 10^{8} j o u l e$
Energy released per fission of $U^{235}$
$= 200 M e V = 32 \times 10^{- 12} J$
Number of $U^{235}$ atoms used
$= \frac{24 \times 36 \times 10^{8}}{32 \times 10^{- 12}} = 27 \times 10^{20}$
Mass of $6 \times 10^{23}$ atoms of $U^{235} = 235 g$
Mass of $27 \times 10^{20}$ atoms of $U^{235}$
$= (\frac{235}{6 \times 10^{23}}) (27 \times 10^{20}) = 1 g$

PHXII13:NUCLEI

363731 Assertion :
There is a chain reaction when uranium is bombarded with slow neutrons.
Reason :
When uranium is bombarded with slow neutrons more neutrons are produced.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

Slow neutron bombardment of $^{235} U$ initiates a chain reaction, yielding products like $^{141} B a,^{92} K r$ , and additional neutrons. The process generates more neutrons, causing subsequent uranium nuclei to undergo fission, creating a self - sustaining chain reaction. So correct option is (1).

PHXII13:NUCLEI

363732 Assertion :
For the fission of heavy nuclei, neutrons are more effective than protons.
Reason :
Protons are heavier than Neutrons.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but reason is correct.

Explanation:

$m_{n} = 1 a m u, m_{p} = 0.938 a m u$ . A neutron is slightly heavier than a proton. Because neutrons lack an electric charge, they can penetrate matter more effectively than protons.Consequently, they exhibit greater effectiveness than protons in fission reactions. So correct option is (3).

PHXII13:NUCLEI

363733 A chain reaction in fission of Uranium is possible because

1 Large amount of energy is released

2 Two intermediate size nuclear fragments are formed

3 More than one neutron is given out in each fission

4 Fragments in fission are radioactive

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