Quantum Physics Flashcards

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1
Q

How does electromagnetic radiation travel through space?

A

as a continuous wave

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2
Q

How does electromagnetic interact with matter?

A

as a discrete energy quanta called photons

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3
Q

What is the definition of an electron volt?

A

the energy transferred when an electron travels through a potential difference of 1 volt

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4
Q

How many joules in 1 electron volt?

A

1.6 x 10^-19J

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5
Q

What does diffraction and superposition of light rely on?

A

radiation acting as a wave

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6
Q

How does radiation act as a wave?

A

wave particle duality

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7
Q

What is the relationship between wavelength associated with particles and momentum

A

inversely proportional

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8
Q

How can electrons be made to diffract?

A

when fired as a beam at a thin piece of polycrystalline graphite

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9
Q

How do electrons act after being fired to diffract?

A

they are diffracted by gaps between the atoms and produce a diffraction pattern when they hit the screen

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10
Q

What is the photoelectric effect?

A

when electromagnetic radiation is shone onto a metal electrons are released from the surface

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11
Q

What is the set up of a gold leaf electroscope?

A

zinc plate on top of a negatively charged stem with a piece of gold leaf attached to the stem

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12
Q

What is initially the same between the gold leaf and the stem so that they repel eachother?

A

the charge

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13
Q

What causes electrons to be released from the plate?

A

shining UV light

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14
Q

What must each electron have at least in order to be released?

A

work function

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15
Q

Why does visible light not release electrons?

A

frequency is too low

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