The ratio of the radius of a classical electron (re = kee2/mec2 = 2.8 * 10 - 15 m)to the radius of a 4He nucleus (r = r0A1/3)is

A) 2.0 B) 0.68 C) 1.5 D) 0.92 E) 2.4 A) 2.0 B) 0.68 C) 1.5 D) 0.92 E) 2.4

When a nucleus at rest spontaneously splits into fragments of mass m1 and m2,the ratio of the momentum of m1 to the momentum of m2 is

A) $- \frac { m _ { 1 } } { m _ { 1 } + m _ { 2 } }$ . B) $- \frac { m _ { 2 } } { m _ { 1 } + m _ { 2 } }$ . C) -1. D) $+ \frac { m _ { 1 } + m _ { 2 } } { m _ { 1 } }$ . E) $+ \frac { m _ { 1 } + m _ { 2 } } { m _ { 2 } }$ . A) $- \frac { m _ { 1 } } { m _ { 1 } + m _ { 2 } }$ . B) $- \frac { m _ { 2 } } { m _ { 1 } + m _ { 2 } }$ . C) -1. D) $+ \frac { m _ { 1 } + m _ { 2 } } { m _ { 1 } }$ . E) $+ \frac { m _ { 1 } + m _ { 2 } } { m _ { 2 } }$ .

The half-life of 131I is 8 days.On a certain day,the activity of an 131I sample is 6.4 mCi.What is its activity 40 days later?

The answer of The half-life of 131I is 8 days.On...

Exam 30: Nuclear Physics

Radiant energy reaching the Earth from the sun is not sufficient to keep the Earth's surface temperature comfortable for life.Of the following,the most likely source of the additional thermal energy is from

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(Multiple Choice)

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Question 1

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A pure sample of ²²⁶Ra contains 2.0 * 10¹⁴ atoms of the isotope.If the half-life of ²²⁶Ra = 1.6 * 10³ years,what is the decay rate of this sample? (1 Ci = 3.7 * 10¹⁰ decays/s)

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Question 2

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7.4*10 ^- ⁸ Ci

The chart below shows part of the radioactive series beginning with the isotope ${ } _ { 90 } ^ { 232 } \mathrm { Th }$ .The isotope marked with an X is $The chart below shows part of the radioactive series beginning with the isotope { } _ { 90 } ^ { 232 } \mathrm { Th } .The isotope marked with an X is$

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Question 3

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Rutherford's experiment,in which he fired alpha particles of 7.7 MeV kinetic energy at a thin gold foil,showed that nuclei were very much smaller than the size of an atom because

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Question 4

Calculate the binding energy per nucleon (MeV/nucleon)for tritium,( ${ } _ { 1 } ^ { 3 } \mathrm { H }$ )a radioactive isotope of hydrogen. Assume: M_p = 1.007 825 u M_n = 1.008 665 u M_t = 3.016 05 u U = 1.66 *10^-²⁷ kg

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Question 5

It is often possible to use the atomic masses when calculating the binding energy of a nucleus.The reason for this is

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Question 6

The isotope,tritium,has a half-life of 12.3 years.Assume we have 10 kg of the substance.What will be the disintegration constant (in s ^- ¹)?

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Question 7

What value of Z (atomic number)and A (mass number)result in the following alpha decay? ${ } _ { 92 } ^ { 238 } U \rightarrow { } _ { z } ^ { A } X + \alpha$

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Question 8

What value of Z (atomic number)and A (mass number)result in the following gamma decay? ${ } _ { 6 } ^ { 12 } \mathrm { C } \rightarrow { } _ { z } ^ { A } \mathrm { X } + \gamma$

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Question 9

Two nuclei which share the same mass number A always are (Hint: Eliminate any wrong answers. )

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Question 10

The isotope,tritium,has a half-life of 12.3 years.Assume we have 10 kg of the substance.How much tritium will be left after 30 years?

(Multiple Choice)

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Question 11

The ratio of the radius of a classical electron (r_e = k_ee²/m_ec² = 2.8 * 10 ^- ¹⁵m)to the radius of a ⁴He nucleus (r = r₀A^1/3)is

(Multiple Choice)

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Question 12

In which of the following decays does the atomic mass number of the daughter nucleus differ from that of the parent nucleus?

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Question 13

When a fast neutron collides with a hydrogen or deuterium nucleus,the most likely result is that

(Multiple Choice)

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Question 14

Homer says that we can safely use nuclear power because all radioactive nuclei are gone after two half-lives.Marge says that only the decay rate is zero after two half-lives.Which one,if either,is correct,and why?

(Multiple Choice)

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Question 15

When a nucleus at rest spontaneously splits into fragments of mass m₁ and m₂,the ratio of the momentum of m₁ to the momentum of m₂ is

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Question 16

For large mass number nuclei which are stable,the ratio of protons to neutrons is

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Question 17

The half-life of ¹³¹I is 8 days.On a certain day,the activity of an ¹³¹I sample is 6.4 mCi.What is its activity 40 days later?

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Question 18

Heavy nuclei are unstable because

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Question 19

Two nuclei may have equal Z,but different A,because they contain

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Question 20

Showing 1 - 20 of 62

Exam 30: Nuclear Physics

Radiant energy reaching the Earth from the sun is not sufficient to keep the Earth's surface temperature comfortable for life.Of the following,the most likely source of the additional thermal energy is from

A pure sample of 226Ra contains 2.0 * 1014 atoms of the isotope.If the half-life of 226Ra = 1.6 * 103 years,what is the decay rate of this sample? (1 Ci = 3.7 * 1010 decays/s)

The chart below shows part of the radioactive series beginning with the isotope 90232Th{ } _ { 90 } ^ { 232 } \mathrm { Th }90232​Th .The isotope marked with an X is

Rutherford's experiment,in which he fired alpha particles of 7.7 MeV kinetic energy at a thin gold foil,showed that nuclei were very much smaller than the size of an atom because

Calculate the binding energy per nucleon (MeV/nucleon)for tritium,( 13H{ } _ { 1 } ^ { 3 } \mathrm { H }13​H )a radioactive isotope of hydrogen. Assume: M p = 1.007 825 u M n = 1.008 665 u M t = 3.016 05 u U = 1.66 *10-27 kg

It is often possible to use the atomic masses when calculating the binding energy of a nucleus.The reason for this is

The isotope,tritium,has a half-life of 12.3 years.Assume we have 10 kg of the substance.What will be the disintegration constant (in s - 1)?

What value of Z (atomic number)and A (mass number)result in the following alpha decay? 92238U→zAX+α{ } _ { 92 } ^ { 238 } U \rightarrow { } _ { z } ^ { A } X + \alpha92238​U→zA​X+α

What value of Z (atomic number)and A (mass number)result in the following gamma decay? 612C→zAX+γ{ } _ { 6 } ^ { 12 } \mathrm { C } \rightarrow { } _ { z } ^ { A } \mathrm { X } + \gamma612​C→zA​X+γ

Two nuclei which share the same mass number A always are (Hint: Eliminate any wrong answers. )

The isotope,tritium,has a half-life of 12.3 years.Assume we have 10 kg of the substance.How much tritium will be left after 30 years?

The ratio of the radius of a classical electron (re = kee2/mec2 = 2.8 * 10 - 15 m)to the radius of a 4He nucleus (r = r0A1/3)is

In which of the following decays does the atomic mass number of the daughter nucleus differ from that of the parent nucleus?

When a fast neutron collides with a hydrogen or deuterium nucleus,the most likely result is that

Homer says that we can safely use nuclear power because all radioactive nuclei are gone after two half-lives.Marge says that only the decay rate is zero after two half-lives.Which one,if either,is correct,and why?

When a nucleus at rest spontaneously splits into fragments of mass m1 and m2,the ratio of the momentum of m1 to the momentum of m2 is

For large mass number nuclei which are stable,the ratio of protons to neutrons is

The half-life of 131I is 8 days.On a certain day,the activity of an 131I sample is 6.4 mCi.What is its activity 40 days later?

Heavy nuclei are unstable because

Two nuclei may have equal Z,but different A,because they contain

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A pure sample of ²²⁶Ra contains 2.0 * 10¹⁴ atoms of the isotope.If the half-life of ²²⁶Ra = 1.6 * 10³ years,what is the decay rate of this sample? (1 Ci = 3.7 * 10¹⁰ decays/s)

Calculate the binding energy per nucleon (MeV/nucleon)for tritium,( ${ } _ { 1 } ^ { 3 } \mathrm { H }$ )a radioactive isotope of hydrogen. Assume: M_p = 1.007 825 u M_n = 1.008 665 u M_t = 3.016 05 u U = 1.66 *10^-²⁷ kg

The isotope,tritium,has a half-life of 12.3 years.Assume we have 10 kg of the substance.What will be the disintegration constant (in s ^- ¹)?

What value of Z (atomic number)and A (mass number)result in the following alpha decay? ${ } _ { 92 } ^ { 238 } U \rightarrow { } _ { z } ^ { A } X + \alpha$

What value of Z (atomic number)and A (mass number)result in the following gamma decay? ${ } _ { 6 } ^ { 12 } \mathrm { C } \rightarrow { } _ { z } ^ { A } \mathrm { X } + \gamma$

The ratio of the radius of a classical electron (r_e = k_ee²/m_ec² = 2.8 * 10 ^- ¹⁵m)to the radius of a ⁴He nucleus (r = r₀A^1/3)is

When a nucleus at rest spontaneously splits into fragments of mass m₁ and m₂,the ratio of the momentum of m₁ to the momentum of m₂ is

The half-life of ¹³¹I is 8 days.On a certain day,the activity of an ¹³¹I sample is 6.4 mCi.What is its activity 40 days later?