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Physics midterm
work book questions
| Question | Answer |
|---|---|
| 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