W/L Ch 13 Physics Quiz

Question 1

AMU is an abbreviation for which of the following?

a. Atomic metric unit
b. Atomic measured unit
c. American metric unit
d. Atomic mass unit

Answer 1

d. Atomic mass unit

Question 2

How many seconds are there in 3 hours and 20 seconds?

a. 200
b. 10,800
c. 10,820
d. 1082

Answer 2

c. 10,820

60sec x 60min = 3,600 sec
3,600 sec x 3 hrs
10,800 seconds
\+ 20 seconds
= 10,820 seconds

Question 3

The force responsible for interaction between particles with a nonzero mass and having infinite range is _________________.

a. electromagnetic
b. gravity
c. weak force
d. strong force

Answer 3

b. gravity

Question 4

Who proposed the first model of the atom?

a. Bohr
b. Thomson
c. Rutherford
d. Planck

Answer 4

b. Thomson

J. J. Thomson’s first model of the atom was a raisin-bread, or plum-pudding, model.

Question 5

An electron’s binding energy is the amount of energy required to remove that electron from the atom and is usually measured in __________.

a. MeV
b. keV
c. Coulombs
d. kilograms

Answer 5

b. keV

The electron binding energy has a negative value and is usually measured in kiloelectron volts, or keV.

Question 6

If sufficient energy is given to the atom, one or more electrons of the atom can overcome their binding energy and can be completely removed from the atom. This process is called __________________.

a. ionization
b. excitation
c. nuclear force
d. frequency

Answer 6

a. ionization

Question 7

When some energy is imparted to the electrons of the atom, they will move to higher energy empty states. This process is called which of the following?

a. Ionization
b. Excitation
c. Nuclear force
d. Frequency

Answer 7

b. Excitation

Excitation takes place when some energy is imparted to the electrons of the atom, causing the electrons to move to higher-energy states, called excited states, and the atom will then reach an unstable state.

Question 8

The number of protons and neutrons in the nucleus is known as _______________.

a. atomic weight
b. strong force
c. atomic mass number
d. nuclear stability

Answer 8

c. atomic mass number

Question 9

Which statement is not true?

a. The nucleus of the atom consists of protons and neutrons.
b. Protons and photons are collectively called nucleons.
c. Protons are positively charged particles.
d. Neutrons are neutral with no electric charge.

Answer 9

b. Protons and photons are collectively called nucleons.

Protons and “neutrons” are considered nucleons.

Question 10

Nuclear binding energy is measured in which of the following?

a. keV
b. Amu
c. MeV
d. Coulombs

Answer 10

c. MeV

Nuclear binding energy is measured in MeV, or mega-electron volts.

Question 11

The speed of light is _______________.

a. 3 x 10^10 m/sec
b. 3 x 10^8 m/min
c. 3 x 10^10 m/min
d. 3 x 10^8 m/sec

Answer 11

ANS: D

Question 12

The unit for frequency is 1/sec, called the _________________.

a. lambda
b. Hertz
c. meter
d. angstrom

Answer 12

b. Hertz

Question 13

Wavelength is represented by ______________.

a. lambda
b. Hertz
c. inch
d. second

Answer 13

a. lambda

𝞴

Question 14

The metric system, or SI, unit of energy is ________________.

a. Hertz
b. meter
c. joule
d. angstrom

Answer 14

c. joule

The metric system, or SI, unit of energy is the joule and is equivalent to 1 kg x m^2/sec^2.

Question 15

One curie (1Ci) equals which of the following?

a. 3.8 x 10^8 dis/sec
b. 3.7 x 10^8 dis/sec
c. 3.7 x 10^10 dis/sec
d. 3.8 x 10^10 dis/sec

Answer 15

c. 3.7 x 10^10 dis/sec

1Ci = unit of radioactivity

Question 16

A mCi (millicurie) equals which of the following?

a. 10^3 Ci
b. 10^–3 Ci
c. 10^–6 Ci
d. 10^6 Ci

Answer 16

b. 10^–3 Ci

Question 17

A radioactive sample is measured to contain 1,000 mCi of radioactivity. If the decay constant of this isotope is 0.105 h^r-1, how much activity will remain after 48 hours?

a. 6.474 mCi
b. 7.368 mCi
c. 0.154 mCi
d. 15.445 mCi

Answer 17

a. 6.474 mCi

A^t = Aoe^–𝞴 t
= (1000 mCi)e^(–0.105)(48)
= 6.474 mCi.

Question 18

The condition in which the half-life of the parent isotope is much greater than the half-life of the daughter isotope is called __________________.

a. transient equilibrium
b. transient attenuation
c. secular attenuation
d. secular equilibrium

Answer 18

d. secular equilibrium

Question 19

The thickness of some added material required to reduce beam intensity to half its original value is called the __________________.

a. half-life
b. inverse square factor
c. half-value layer (HVL)
d. intensity coefficient

Answer 19

c. half-value layer (HVL)

Question 20

Which of the following is the most common photon interaction that occurs in the energy range used in radiation therapy?

a. Photoelectric
b. Compton
c. Photodisintegration
d. Thomson

Answer 20

b. Compton

Question 21

The smallest unit of an element that retains the properties of that element is known as a(n) _________________.

a. molecule
b. quark
c. hadron
d. atom

Answer 21

d. atom

Question 22

There are four major quantities that are important in radiation physics. They are radiation exposure, radiation absorbed dose, radiation dose equivalent, and ________________.

a. radioactivity
b. magnetism
c. electromagnetism
d. frequency

Answer 22

a. radioactivity

Question 23

Rest mass refers to the _______ of a particle when it is not moving.

a. energy
b. charge
c. force
d. weight

Answer 23

d. weight

Question 24

The coulomb is the metric unit of electrical ______________.

a. mass
b. charge
c. energy
d. frequency

Answer 24

b. charge

Question 25

A beta minus particle is also known as a(n) ____________.

a. electron
b. proton
c. hadron
d. neutron

Answer 25

a. electron