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Physics I
Chapter 4 - Electromagnetic Radiation
| Question | Answer |
|---|---|
| What are the 4 properties of photons? | frequency, wavelength, velocity, amplitude |
| ____ is a quantum of electromagnetic energy | x-ray photon |
| Which part of the sine wave does amplitude represent? | The top half |
| - 1/2 the range from crest to valley over which the sine wave varies | amplitude |
| What is the sign of frequency? | nu |
| - how often the crests of a wave occur | frequency |
| What is the unit of measurement of frequency? | Hz |
| What is the sign of wavelength? | lamda |
| What is the unit of measurement for wavelength? | angstrom |
| - the distance btwn the crests of a wave? | wavelength |
| - refers to the strongest photon in the beam of radiation | min wavelength |
| frequency and wavelength are ____ proportional | inversely |
| What are the 3 regions of electromagnetic spectrum? | visible light, radio frequency, x-radiation |
| List in order from longest/lowest to shortest/highest: x-ray, radio, visible light, gamma, cosmic, infra-red, microwaves | radio, microwaves, visible light, x-ray, gamma, cosmic |
| - where pure energy act as though it has the characteristics of matter | wave-particle duality |
| What is an ex of the wave-particle duality? | where a x-ray photon dislodges an electron from an atom |
| -when light is deviated from its line of travel | refraction |
| - a substance that absorbs radiation / seen as white or clear on the image | radiopaque |
| - a substance that attenuates radiation / seen as a dark area on the image | radiolucent |
| x-rays are _____ proportional to frequency | directly |
| what is the law of conservation of energy? | energy can never be created or destroyed / e=mc2 |
| x-ray wavelength is _______ proportional to frequency. | inversley |
| Which is true for both 100 keV xray and 10 keV gamma ray? | they have zero mass |
| A single unit of electromagnetic radiation is also called a _____ | photon |
| Which of the following has a constant value for all electromagnetic radiation? | velocity |
| The amplitude of a sine wave is its: | zero to max |
| The principal difference btwn x-rays and gamma rays is their: | origin |
| For any electromagnetic radiation: | an increase in frequency results in an increase in energy |
| If an x-ray imaging system is operated at 40 kVp, then: | 20 keV xrays are emitted |
| Which of the following characteristics is the same for both ultraviolent radiation and microwaves? | velocity |
| xrays can be: | attenuated |
| When a radiograph is viewed, one might properly state that: | lung tissue is radiolucent |
| According to quantum mechanics, the energy of x-ray is: | inversely proportional to its wavelength |
| In radiographs of bony structures embedded in soft tissue, the bone is: | radiopaque |
| Which of the following types of electromagnetic radiation interacts with matter such as a particle? | gamma rays |
| If the exposure rate 1 m from a source is 9 mR/hr, what is the exposure rate 3 m from the source? | 1 mR/hr |
| The inverse square law states what? | Intensity is inversely proportional to the square of the distance |
| The inverse square law is a result of: | divergence |
| The inverse square relationship applies to which of the following sources? | point |
| To apply the inverse square law, one must know: | two distances and one intensity |
| Which of the following terms is associated with diagnostic imaging? | superficial x-rays |
| The energy of an xray photon is directly proportional to its: | frequency |
| The energy of and x-ray : | is inversely proportional to its wavelength |
| An xray also can be correctly called a: | photon |
Created by:
erikasmith28
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