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Chapter 4 Test Guide

Basic Physics for Radiography

QuestionAnswer
Which of the following would be considered a basic form of matter? 1. Solid & 2. Liquid
The quantity of matter that makes up any physical object is called the: mass
Which of the following is located in an orbit around the nucleus of an atom? Electron
Which of the following has negative (-) electrical charge? Neutron
Which of the following are considered fundamental particles of atom? 1. Neutrons & 3. Protons
When a neutral atom gains or loses an electron, the atom is said to be? Ionized
Mechanical energy can be classified as either kinetic energy or: Potential energy
X-rays consist of: Electromagnetic energy
X-rays with greater energy have a shorter _____ and are more penetrating. Wavelength
Of the following types of electromagnetic energy, which has the shortest wavelength? Diagnostic rays
Which of the following are accurate statements regarding the characteristics of x-rays? 1. They are highly penetrating and invisible. 3. They travel in straight lines at the speed of light.
The smallest possible unit of electromagnetic energy is the: Photon
The term for a continuous path for the flow of electrical charges from the power source through one or more electrical devices and back to the source is: Electrical circuit
The common unit of measure for the potential difference across an x-ray tube is the: Volt
The frequency of alternating current (AC) delivered by electric utilities in the United States and Canada is: 60 Hz
The purpose of a transformer is to: Increase or decrease voltage
Which electron shell in the atom is most important for the production of x-rays? K
Electrons are held in place around the nucleus of the atom by a: Shell
When an atom gains or loses an electron it is called an: ion
The process of converting AC to DC is called: rectification
One of the most important elements in radiology that is used to create the x-rays is: Lead
X-rays cause ionization in the human body. This has a negative effect on the body. True
When a step-up transformer increases voltage from the primary side to the secondary side of a transformer, amperage is increased. False
If a transformer has 100 turns on the primary side and 25 turns on the secondary side, it is a step-down transformer. True
A transformer with a 500:1 ratio would be step-up transformer. True
X-rays with greater energy have a lower frequency. False
Ammeter Measures electrical current
Voltmeter Measures electrical potential
Transformer Increases or decreases voltage by a fixed amount (AC only)
Alternating current Current changes polarity from negative to positive at regular intervals
Kilovolt (kV) Equal to 1000 volts
Rectification Process of changing AC to DC
Ampere (A) Unit to measure the rate of current flow in a circuit
Milliampere (mA) Equal to 0.001 A (1/1000 A)
Volt (V) Unit to measure potential difference
Current Quantity of electrons flowing in a circuit
Created by: jenren18