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1015 Medical Radiation Sciences > electromagnetic radiation > Flashcards

electromagnetic radiation Flashcards

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USMLE® Step 1 flashcards
1
Q

what is radiation

A

the transmission of energy through waves of particles

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2
Q

how are electromagnetic waves created

A

by disturbances in a charge

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3
Q

do waves have weight

A

no

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4
Q

what is wave theory

A

emr affects both magnetic and electrical fields
the fields creates transverse waves perpendicular to the direction of energy

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5
Q

what is amplitude

A

the maximum field strength

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6
Q

what is wavelength

A

distance between the same points in a wave

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7
Q

what is the formula for a period

A

period (T) = 1/f

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8
Q

what is the speed of light

A

1x10^8 m/s

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9
Q

when does emr travel at the speed of light

A

in a vaccum

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10
Q

rank highest to lowest intensity:
radio
x-ray
inrared
gamma
uv

A

gamma, x-rays, UV, infrared, radio

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11
Q

what are the wave-like interactions of emr

A

reflection
refraction
diffraction

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12
Q

what is reflection

A

bouncing off an interface

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13
Q

what is refraction

A

a change in direction due to a change in speed

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14
Q

what is diffraction

A

waves bending around borders to create a pattern

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15
Q

what is the formula for E

A

E = hf

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16
Q

what is the formula for frequency?

A

f = c wavelength

17
Q

what are the particle like interactions of emr

A

ionization
excitation
fluorescnece

18
Q

what is ionozation

A

radiation hits and electron, creating a negative ion (free electron) and a positive ion (remaining atom)

19
Q

what is excitation

A

photon hits an atome, exciting an electron, causing it to jump to a higher valence level

20
Q

what is fluorescence

A

when an atom gets excited, the relaxes, the excited electrons drops back to its valence shell, releasing the excess energy as fluorescent light

21
Q

(lower/higher) energy tends to act more like (waves/particles)

A

low energy acts as waves
high energy acts as particles

1015 Medical Radiation Sciences (13 decks)

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