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Physics midterm

work book questions

QuestionAnswer
What is the principal difference between mass and weight? Mass is the equivalence of energy; weight is the force exerted by by gravity.
Energy is defined as... the ability to do work
radiation is... energy transferred
The roentgen relates to what? Ions produced in the air
The rad is related most closely to what? the gray
What was the device with which Roentgen discovered x-rays? crookes tube
The phosphor that Roentgen used in early experiments with x-rays was what? Barium platinocyanide
How are x-ray tube voltages measured? Kilovolt
Who developed fluoro? Thomas edison
Which type of tube is used today? Coolidge tube
The bucky grid was introduced in what year? 1921
What does the bucky grid do? improves image contrast
What describes the coolidge x-ray tube? Heated cathode
Of the cardinal rules of radiation protection one states you should minimize what? time
Do intensifying screens reduce patient dose? yes
What will reduce personnel exposure the most? Use of protective barriers for rts
After termination of an x-ray exposure... no more x-rays are emitted
10 -12 pico-
10 -9 nano-
10 -6 micro-
10 -3 milli-
10 -2 centi-
10 +3 kilo-
10 +6 mega-
10 +9 giga-
10 +12 tera-
the radiologic unit mAs is actually measured in what? Charge and number if electrons
The roentgen is a unit of measure that specifies what? intensity of x-rays`
what describes the use of the rad? to measure energy absorbed by tissue
What is a classic radiologic unit? Rem
Absorbed dose can be measured in? Gy
Which of the following is not a unit of energy? a. calorie b. electron volt c. Erg d. joule e. Rad C. Erg
Which of the following is a unit of radioactivity? a.Ci b.Gy c.J d.R e.Rad A. Ci
1 R is equal to how many joules? 1 Joules
Another name for velocity is.. speed
An object at rest will remain at rest unless acted on by an external force describes what? Newtons first law of motion
Acceleration is also.. a. the product of time and distance b. the rate of change of velocity with time c. time squared B. the rate of change of velocity with time
The car was speeding north at 80 mph refers to what? a vector quantity
Which of the following is the primary method of heat dissipation from the rotating anode of the x-ray tube? a.conduction b.convection c.convention d.radiation d.radiation
the product of force and distance? work
Rutherford described the atomic bomb? true/false false. he described the nuclear atom
The periodic table presents the elements in order of: a.atomic charge b.atomic number c.atomic mass b. atomic number
The horizontal rows in the periodic table are called what? periods
Atoms with all electrons filled are.. chemically stable
In the periodic table of the elements , the group number identifies.. a.number of electrons allowed in outer shell b.total number of electrons in the atom a.
Bohr is the physicists who... described the atom we know today
protons plus neutrons is.. the atomic mass number
the atomic number is.... the number of protons
when a radioisotope emits a beta particle: a.a gamma ray is always emitted b.a neutron is converted to a proton c.neither b
atoms that have the same atomic number but different atomic mass numbers are.. isotopes
alpha emission results in... loss of 4 amu
x-rays have no mass and no charge. true/false true
the frequency of electromagnectic radiation is measured in.. a.hertz b.coulombs c.velocity a. hertz
intensity is inversely proportional tot he square of the distance states what? the inverse square law
the energy of an x-ray photon is directly proportional to its: frequency
what is the principal reservoir for excess electric charge? the earth
the unit of electrostatic charge is the: a.coulomb b.ampere c.newton a. coulomb
unit of electrical potential is.. volt
the ohms law states.. the electric potential is the product of current and resistance
Created by: chrystal87
 

 



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