The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10−15 m) is

A) 4.3 × 102 B) 2.3 × 104 C) 1.4 × 102 D) 6.9 × 10−3 E) 4.3 × 103 A) 4.3 × 102 B) 2.3 × 104 C) 1.4 × 102 D) 6.9 × 10−3 E) 4.3 × 103

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

A) . B) . C) −1. D) . E) . A) . B) . C) −1. D) . E) .

Exam 44: Nuclear Structure

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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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Question 41

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?

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Question 42

A self-sustained chain reaction occurs when the reproduction constant, K, is equal to

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Question 43

How many grams of deuterium (atomic mass = 2.0141 u) must be fused to helium (atomic mass 4.0026 u) in one second to produce 3000 MJ of energy? [1 u = 1.66 × 10−²⁷ kg]

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Question 44

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 45

How much kinetic energy must a deuterium ion (charge 1.6 × 10−¹⁹ C) have to approach to within 10−¹⁴ m of another deuterium ion? (1 MeV = 1.6 × 10−¹³ J)

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Question 46

The half-life of ¹³¹I is 8.04 days. Three days after it was prepared, its activity was 0.50 μCi. How many curies (in μCi) were initially prepared?

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Question 47

What energy is needed (in MeV) so two deuterium atoms moving together will reach the necessary 10−¹⁴ m for fusion?

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Question 48

The ratio of the density of a neutron (r = r₀A^1/3) to the density of a classical electron (r_e = ke²/m_ec² = 2.8 × 10−¹⁵ m) is

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Question 49

What value of Z (atomic number) and A (mass number) result in the following gamma decay?

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Question 50

Approximately how much uranium (in kg) must undergo fission per day to provide 1 000 MW of power? (Assume an efficiency of 30%). The nuclear reaction is . m(n) = 1.008 665 u M(U) = 235.043 915 u M(Ba) = 140.913 9 u M(Kr) = 91.897 3 u U = 1.66 × 10−²⁷ kg

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Question 51

The radius of an approximately spherical nucleus is given by r =

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Question 52

The Q value for the following reaction, , is (in MeV) m(alpha) = 4.002 603 u M(Be) = 9.012 182 u M(n) = 1.008 665 u M(C) = 12.000 00 u 1 u = 1.66 × 10−²⁷ kg

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Question 53

The radius of a nucleus of (in fm) is

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Question 54

A beam of 1-MeV gamma rays incident on a piece of 0.50-cm thick lead is reduced by 50% of its initial value. How thick must the lead be to reduce the beam to one percent of its initial value?

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Question 55

Which of the following is not a radiation detector?

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Question 56

What value of Z (atomic number) and A (mass number) result in the following β-decay?

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Question 57

Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm−¹ for x-rays of wavelength 10 × 10−¹² m.)

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Question 58

What value of Z (atomic number) and A (mass number) result in the following β-decay?

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Question 59

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

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Question 60

Showing 41 - 60 of 89

Exam 44: Nuclear Structure

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

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?

A self-sustained chain reaction occurs when the reproduction constant, K, is equal to

How many grams of deuterium (atomic mass = 2.0141 u) must be fused to helium (atomic mass 4.0026 u) in one second to produce 3000 MJ of energy? [1 u = 1.66 × 10−27 kg]

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?

How much kinetic energy must a deuterium ion (charge 1.6 × 10−19 C) have to approach to within 10−14 m of another deuterium ion? (1 MeV = 1.6 × 10−13 J)

The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 μCi. How many curies (in μCi) were initially prepared?

What energy is needed (in MeV) so two deuterium atoms moving together will reach the necessary 10−14 m for fusion?

The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10−15 m) is

What value of Z (atomic number) and A (mass number) result in the following gamma decay?

Approximately how much uranium (in kg) must undergo fission per day to provide 1 000 MW of power? (Assume an efficiency of 30%). The nuclear reaction is . m(n) = 1.008 665 u M(U) = 235.043 915 u M(Ba) = 140.913 9 u M(Kr) = 91.897 3 u U = 1.66 × 10−27 kg

The radius of an approximately spherical nucleus is given by r =

The Q value for the following reaction, , is (in MeV) m(alpha) = 4.002 603 u M(Be) = 9.012 182 u M(n) = 1.008 665 u M(C) = 12.000 00 u 1 u = 1.66 × 10−27 kg

The radius of a nucleus of (in fm) is

A beam of 1-MeV gamma rays incident on a piece of 0.50-cm thick lead is reduced by 50% of its initial value. How thick must the lead be to reduce the beam to one percent of its initial value?

Which of the following is not a radiation detector?

What value of Z (atomic number) and A (mass number) result in the following β-decay?

Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm−1 for x-rays of wavelength 10 × 10−12 m.)

What value of Z (atomic number) and A (mass number) result in the following β-decay?

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

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How many grams of deuterium (atomic mass = 2.0141 u) must be fused to helium (atomic mass 4.0026 u) in one second to produce 3000 MJ of energy? [1 u = 1.66 × 10−²⁷ kg]

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?

How much kinetic energy must a deuterium ion (charge 1.6 × 10−¹⁹ C) have to approach to within 10−¹⁴ m of another deuterium ion? (1 MeV = 1.6 × 10−¹³ J)

The half-life of ¹³¹I is 8.04 days. Three days after it was prepared, its activity was 0.50 μCi. How many curies (in μCi) were initially prepared?

What energy is needed (in MeV) so two deuterium atoms moving together will reach the necessary 10−¹⁴ m for fusion?

The ratio of the density of a neutron (r = r₀A^1/3) to the density of a classical electron (r_e = ke²/m_ec² = 2.8 × 10−¹⁵ m) is

Approximately how much uranium (in kg) must undergo fission per day to provide 1 000 MW of power? (Assume an efficiency of 30%). The nuclear reaction is . m(n) = 1.008 665 u M(U) = 235.043 915 u M(Ba) = 140.913 9 u M(Kr) = 91.897 3 u U = 1.66 × 10−²⁷ kg

The Q value for the following reaction, , is (in MeV) m(alpha) = 4.002 603 u M(Be) = 9.012 182 u M(n) = 1.008 665 u M(C) = 12.000 00 u 1 u = 1.66 × 10−²⁷ kg

Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm−¹ for x-rays of wavelength 10 × 10−¹² m.)

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