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Rad Physics (Radt 134) > Unit 3 Chapter 3 > Flashcards

Unit 3 Chapter 3 Flashcards

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0
Q

A form of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space

A

Electromagnetic energy

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1
Q

Electromagnetic Energy that has neither mass nor electric charge but interacts with matter as though it is a particle

A

Photon

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2
Q

The smallest quantity of electromagnetic energy

A

Photon

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3
Q

A small bundle of energy

A

Quantum

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4
Q

Travels at the speed of light

A

Photon

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5
Q

What forms of electromagnetic energy are described as photons?

A

X-rays light and other forms

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6
Q

The smallest quantity of any type of electromagnetic radiation is a(n) _____

A

The smallest quantity of any type of electromagnetic radiation is a photon.

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7
Q

What is the velocity of all electromagnetic radiation?

A

The velocity of all electromagnetic radiation is 3 ´ 108 m/s

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8
Q

A hertz (Hz) is equal to _____ cycle(s) per second.

A

A hertz is equal to 1 cycle per second

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9
Q

The _____ of electromagnetic radiation is constant.

A

The velocity of electromagnetic radiation is constant.

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10
Q

If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then its frequency must _____.

A

If the wavelength of a beam of electromagnetic radiation increases by a factor of 2, then its frequency must decrease by half

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11
Q

The intensity of radiation _____ in _____ proportion to the square of the distance of the object from the source.

A

The intensity of radiation decreases in inverse proportion to the square of the distance of the object from the source

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12
Q

The reduction of radiation intensity due to scattering and absorption is called _____

A

The reduction of radiation intensity due to scattering and absorption is called attenuation.

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13
Q

The intensity of radiation on an object is reduced with distance because the radiation _____.

A

The intensity of radiation on an object is reduced with distance because the radiation is spread out over a greater area.

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14
Q

If the intensity of light from a flashlight is 4 millilumens (mlm) at a distance of 3 feet, what will the intensity be at 6 feet?

A

If the intensity of light from a flashlight is 4 millilumens (mlm) at a distance of 3 feet using the inverse square law, it will be 1 millilumen at 6 feet.

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15
Q

The energy of a photon is directly proportional to its _____.

A

The energy of a photon is directly proportional to its frequency.

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16
Q

The mass equivalent of a 100 KeV photon of radiation can be calculated using the _____.

A

The mass equivalent of a 100 KeV photon of radiation can be calculated using the relativity formula.

17
Q

X-rays are usually identified by their _____.

A

X-rays are usually identified by their energy

18
Q

The lowest energy range of the electromagnetic spectrum is _____.

A

The lowest energy range on the electromagnetic spectrum is radio waves.

19
Q

Gamma rays are produced in the _____ of the atom.

A

Gamma rays are produced in the nucleus of the atom.

20
Q

Photons tend to interact with matter _____ their wavelength

A

Photons tend to interact with matter equal in size to their wavelength.

21
Q

Photons with the highest frequencies have the _____

A

Photons with the highest frequencies have the shortest wavelengths

22
Q

A fluoroscopy unit is run at 30 inches source-to-skin distance and produces an exposure of 100mR/week. What is the exposure if it is run at 90 inches source to skin distance?

A

11.1 mR/week

23
Q

What type of relationship does frequency and wavelength have in the electromagnetic spectrum?

A

Inverse relationship

24
Q

What happens to the frequency of a sine wave if the wavelength is doubled?

A

Frequency is halved

25
Q

Which portion of the electromagnetic spectrum contains photons withthe highest velocity?

A

No change in velocity

26
Q

Which color of visible light has the longest wavelength?

A

red

27
Q

Which color of visible light has the highest energy?

A

violet

28
Q

Which of the following does NOT use microwaves?

doppler radar monitoring

cell phone communication

speed monitoring

TV remote controls

A

TV remote controls

29
Q

What differentiates a light photon from an x ray photon

frequency

wavelength

energy

velocity

all of the above

a, b and c

A

a, b, and c

30
Q

Which of the following relationships is TRUE concerning the energy of electromagnetic radiation?

The energy of a wave will increase as it wavelength increases

The energy of a wave will increase as its frequency increases

The energy increases as the velocity of the wave increases

The energy of the wave increases as the mass increases

A

The energy of a wave will increase as its frequency increases

31
Q

The partial absorption of energy by any form of matter is termed

A

Diffraction

32
Q

Exitation and immediate release of a photon is

A

Reflection

33
Q

The mass-energy equivalency of electromagnetic energy and matter was first predicted by:

A

Albert Einstein

34
Q

Which of the following is not a variation of the electromagnetic wave equation?

c=fl

E=hf

f=c/l

l=c/f

A

E=hf

35
Q

Electromagnetic radiation travels:

A

In waves along a striaght path

36
Q

Electromagnetic radiation travels in bundles of energy called

A

Photons

37
Q

Wavelength is defined as the distance from:

A

Peak to peak of the wave

38
Q

Waves of radiation are called

A

Sine waves

39
Q

Frequency is defined as:

A

The number of waves passing a point per unit of time

40
Q

Wavelength and frequency are

A

Inversely proportional to each other

41
Q

All photons with wavelengths longer than x-rays act primarily as waves. T or F

A

True

Rad Physics (Radt 134) (6 decks)

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