Question 1

The iron nucleus has the greatest binding energy of any nucleus.

Accepted Answer

A) True 
 B)False

Question 2

The maximum permissible workday dose for occupational exposure to radiation is 26 mrem. A 55-kg laboratory technician absorbs 3.3 mJ of 0.40-MeV gamma rays in a workday. The relative biological efficiency (RBE) for gamma rays is 1.00. What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage?

Accepted Answer

A)  0.23 
B)  0.25 
C)  0.28 
D)  0.30 
E)  0.32 
A)  0.23 
B)  0.25 
C)  0.28 
D)  0.30 
E)  0.32

Question 3

The unstable isotope 234Th decays by β emission with a half-life of 24.5 days. The initial decay rate of the sample was 9.9 × 1013 Bq. (1 u = 1.6605 x 10-27 kg)
(a) What mass of 234Th was initially present?
(b) What is the decay rate after 68 days?

Accepted Answer

(a) 0.12 g

Question 4

If a nucleus decays by β- decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)

Accepted Answer

A)  The daughter nucleus has more protons than the original nucleus. 
B)  The daughter nucleus has more neutrons than the original nucleus. 
C)  The daughter nucleus has the same number of nucleons as the original nucleus. 
D)  The daughter nucleus has fewer protons than the original nucleus. 
E)  The daughter nucleus has fewer neutrons than the original nucleus. 
A)  The daughter nucleus has more protons than the original nucleus. 
B)  The daughter nucleus has more neutrons than the original nucleus. 
C)  The daughter nucleus has the same number of nucleons as the original nucleus. 
D)  The daughter nucleus has fewer protons than the original nucleus. 
E)  The daughter nucleus has fewer neutrons than the original nucleus.

Question 5

A certain nucleus containing 8 protons and 7 neutrons has a density ρ. Which of the following values would be closest to the expected value of the density of a nucleus having 51 protons and 69 neutrons?

Accepted Answer

A)  1.00 ρ 
B)  1.85 ρ 
C)  2.00 ρ 
D)  2.14 ρ 
E)  8.00 ρ 
A)  1.00 ρ 
B)  1.85 ρ 
C)  2.00 ρ 
D)  2.14 ρ 
E)  8.00 ρ

Exam 42: Nuclear Physics

The iron nucleus has the greatest binding energy of any nucleus.

The unstable isotope 234Th decays by β emission with a half-life of 24.5 days. The initial decay rate of the sample was 9.9 × 1013 Bq. (1 u = 1.6605 x 10-27 kg) (a) What mass of 234Th was initially present? (b) What is the decay rate after 68 days?

If a nucleus decays by β- decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)

A certain nucleus containing 8 protons and 7 neutrons has a density ρ. Which of the following values would be closest to the expected value of the density of a nucleus having 51 protons and 69 neutrons?

Concepts of Motion

Kinematics in One Dimension

Vectors and Coordinate Systems

Kinematics in Two Dimensions

Force and Motion

Dynamics I: Motion Along a Line

Newtons Third Law

Dynamics Ii: Motion in a Plane

Impulse and Momentum

Energy

Work

Rotation of a Rigid Body

Newtons Theory of Gravity

Oscillations

Fluids and Elasticity

A Macroscopic Description of Matter

Work, Heat, and the First Law of Thermodynamics

The Micromacro Connection

Heat Engines and Refrigerators

Traveling Waves

Superpositions

Wave Optics

Ray Optics

Optical Instruments

Electric Charges and Forces

The Electric Field

Gausss Law

The Electric Potential

Potential and Field

Current and Resistance

Fundamentals of Circuits

The Magnetic Field

Electromagnetic Induction

Electromagnetic Fields and Waves

Ac Circuits

Relativity

The Foundations of Modern Physics

Quantization

Wave Functions and Uncertainty

One-Dimensional Quantum Mechanics

Atomic Physics

Filters

The unstable isotope ²³⁴Th decays by β emission with a half-life of 24.5 days. The initial decay rate of the sample was 9.9 × 10¹³ Bq. (1 u = 1.6605 x 10^-27 kg) (a) What mass of ²³⁴Th was initially present? (b) What is the decay rate after 68 days?

If a nucleus decays by β^-decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)