Quantum Phenomena Flashcards

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1
Q

What is work function?

A

Work function is the minimum energy required for an electron to be released from a metal

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2
Q

Explain why the kinetic energy of the emitted electrons has a maximum value

A
  • The energy is the same in all photons

- The energy required to remove the electron varies

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3
Q

Unit for work function

A

Joule

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4
Q

Equation for Ke

A

Ke=1/2mv^2

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5
Q

Equation for De broglie wavelength involving mass

A

Lambda = Planck’s constant/Mass x Velocity

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6
Q

Equation for De broglie wavelength involving momentum

A

Lambda = Planck’s constant/Momentum

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7
Q

How would increasing the frequency of light affect electrons being emitted

A

The maximum kinetic energy would increase due to the frequency of the photons increasing their energy

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8
Q

How would increasing the intensity of light affect electrons being emitted

A

The rate of photons emitted increases as there are more photons hitting the surface of the metal.

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9
Q

What is meant by validated evidence

A

The experiment needs to be performed and then the results of the experiment needs to be proved and repeatable

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10
Q

Explain why the emitted electrons have a range of kinetic energies up to a maximum
value

A

The energy of photons stays constant and since the interaction between photons and electrons is one to one, the maximum kinetic

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11
Q

In a fluorescent tube, explain how the mercury vapour and the coating of its inner surface
contribute to the production of visible light.

A

Mercury at low pressure becomes excited by the electrons that collide with the atoms, the mercury atom then produce UV radiation, the coating of the flourescent tube absorbs the UV radiation and emits it as visible light, which makes the excited electrons cascade down energy levels.

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12
Q

What is meant by ground state?

A

When electrons are at their lowest energy state

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13
Q

Explain the difference between excitation and ionisation

A

In both cases the electron recieves energy while excitation moves the electron to a higher energy level and ionisation occurs when an electron recieves enough energy to leave the atom

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14
Q

Equation for photoelectric effect

A

E = hf

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