Question 1

What kind of decay is the decay of   into   and which particles are being emitted?

Accepted Answer

â^--decay, electron, and antineutrino RAT: The atomic number increases, a neutron turns into a proton, and atomic mass remains the same.

Question 2

Isotopic nuclides are nuclides with the same mass number.

Accepted Answer

A) True 
 B)False  False

Question 3

Which of these processes does NOT lead to a loss of charge in a nucleus?

Accepted Answer

A) alpha decay 
B) beta decay 
C) gamma decay 
D) electron capture 
A) alpha decay 
B) beta decay 
C) gamma decay 
D) electron capture C

Question 4

What is the fraction of nuclei from the initial radioactive sample that have decayed after 3 half-lives?

Accepted Answer

A) 7/8 
B) 3/4 
C) 1/2 
D) 1/8 
A) 7/8 
B) 3/4 
C) 1/2 
D) 1/8

Question 5

A radioactive sample is left to decay for 4 half-lives. The fraction of the sample that decayed is 1/16.

Accepted Answer

A) True 
 B)False

Question 6

What kind of decay is the decay of   into   and which particles are being emitted?

Accepted Answer

â⁺-decay; positron and neutrino

Question 7

11C, 12C, 13C, and 14C are examples of isobaric nuclides.

Accepted Answer

A) True 
 B)False

Question 8

Describe briefly an isomer. What is the difference between 12Cg and 12Cm?

Accepted Answer

Isomers are nuclei that have identical c

Question 9

How does the mass of an atomic nucleus compare with the sum of masses of its constituent nucleons separated?

Accepted Answer

A) The mass of a nucleus is larger than the sum of the masses of individual nucleons. 
B) The mass of a nucleus is smaller than the sum of the masses of individual nucleons. 
C) The mass of a nucleus is the same as the sum of the masses of individual nucleons. 
D) The answer depends on the mass number of the element. 
A) The mass of a nucleus is larger than the sum of the masses of individual nucleons. 
B) The mass of a nucleus is smaller than the sum of the masses of individual nucleons. 
C) The mass of a nucleus is the same as the sum of the masses of individual nucleons. 
D) The answer depends on the mass number of the element.

Question 10

Discuss briefly how transition energy, ÄE, between two states of a spin-   /2 nucleus in an external magnetic field of 1 T (f = 50 MHz) compares to the Balmer series in a H atom, for example, the electron transition between n2 and n3 levels that involves a photon of wavelength ë = 655 nm.

Accepted Answer

nucleus f = 50 MHz = 5 × 10⁷ Hz at 1 T; e

Question 11

What are isotopic nuclides?

Accepted Answer

A) nuclei of the same element with different numbers of neutrons 
B) nuclei of different elements with the same number of nucleons 
C) nuclei of the same element with different numbers of protons 
D) nuclei of different elements with the same number of protons 
A) nuclei of the same element with different numbers of neutrons 
B) nuclei of different elements with the same number of nucleons 
C) nuclei of the same element with different numbers of protons 
D) nuclei of different elements with the same number of protons

Question 12

When an isomer decays, which of the following particles does it emit?

Accepted Answer

A) alpha particles 
B) electrons 
C) positrons 
D) ã-photons 
A) alpha particles 
B) electrons 
C) positrons 
D) ã-photons

Question 13

How many neutrons are in the nucleus of carbon 14C?

Accepted Answer

A) 6 
B) 7 
C) 8 
D) 14 
A) 6 
B) 7 
C) 8 
D) 14

Question 14

How many protons are in the nucleus of oxygen 16O?

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 16 
A) 4 
B) 6 
C) 8 
D) 16

Question 15

Electron capture is the equivalent of a beta radioactive decay.

Accepted Answer

A) True 
 B)False

Question 16

Using Table 22.1, calculate the energy released in the process of uranium decay:   into

Accepted Answer

E = 4.273

Question 17

What is the mass number of an atomic nucleus equal to?

Accepted Answer

A) the number of protons 
B) the number of neutrons 
C) the number of protons and neutrons 
D) the number of electrons 
A) the number of protons 
B) the number of neutrons 
C) the number of protons and neutrons 
D) the number of electrons

Question 18

The Larmor frequency is the angular precession frequency of a nuclear spin in an external magnetic field.

Accepted Answer

A) True 
 B)False

Question 19

Which of these processes does NOT lead to the loss of a nucleon from a nucleus?

Accepted Answer

A) á-decay 
B) â+-decay 
C) â--decay 
D) electron capture 
A) á-decay 
B) â+-decay 
C) â--decay 
D) electron capture

Question 20

Calculate the strength of an NMR magnet if the Larmor frequency of protons in that field is 100 MHz. The gyromagnetic ratio for protons is ã/2ð = 42.58 MHz/T.

Accepted Answer

B = 2.349

Exam 22: The Atomic Nucleus

What kind of decay is the decay of into and which particles are being emitted?

Isotopic nuclides are nuclides with the same mass number.

Which of these processes does NOT lead to a loss of charge in a nucleus?

What is the fraction of nuclei from the initial radioactive sample that have decayed after 3 half-lives?

A radioactive sample is left to decay for 4 half-lives. The fraction of the sample that decayed is 1/16.

What kind of decay is the decay of into and which particles are being emitted?

11C, 12C, 13C, and 14C are examples of isobaric nuclides.

Describe briefly an isomer. What is the difference between 12Cg and 12Cm?

How does the mass of an atomic nucleus compare with the sum of masses of its constituent nucleons separated?

Discuss briefly how transition energy, ÄE, between two states of a spin- /2 nucleus in an external magnetic field of 1 T (f = 50 MHz) compares to the Balmer series in a H atom, for example, the electron transition between n2 and n3 levels that involves a photon of wavelength ë = 655 nm.

What are isotopic nuclides?

When an isomer decays, which of the following particles does it emit?

How many neutrons are in the nucleus of carbon 14C?

How many protons are in the nucleus of oxygen 16O?

Electron capture is the equivalent of a beta radioactive decay.

Using Table 22.1, calculate the energy released in the process of uranium decay: into

What is the mass number of an atomic nucleus equal to?

The Larmor frequency is the angular precession frequency of a nuclear spin in an external magnetic field.

Which of these processes does NOT lead to the loss of a nucleon from a nucleus?

Calculate the strength of an NMR magnet if the Larmor frequency of protons in that field is 100 MHz. The gyromagnetic ratio for protons is ã/2ð = 42.58 MHz/T.

Physics and the Life Sciences

Kinematics

Forces

Newtons Laws

Centre of Mass and Linear Momentum

Torque and Equilibrium

Energy and Its Conservation

Gases

Thermal Physics

Transport of Energy and Matter

Static Fluids

Fluid Flow

Elasticity and Vibrations

Waves

Sound

Electric Force and Field

Electric Energy and Potential

The Flow of Charges

The Atom

Magnetism and Electromagnetic Waves

Geometric Optics

Diagnostic Ultrasound Imaging

Diagnostic X-Ray Imaging

Diagnostic Nuclear Medicine Imaging

Magnetic Resonance Imaging

Radiation Therapy

Filters

¹¹C, ¹²C, ¹³C, and ¹⁴C are examples of isobaric nuclides.

Describe briefly an isomer. What is the difference between ¹²C^g and ¹²C^m?

Discuss briefly how transition energy, ÄE, between two states of a spin- /2 nucleus in an external magnetic field of 1 T (f = 50 MHz) compares to the Balmer series in a H atom, for example, the electron transition between n₂ and n₃ levels that involves a photon of wavelength ë = 655 nm.

How many neutrons are in the nucleus of carbon ¹⁴C?

How many protons are in the nucleus of oxygen ¹⁶O?