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Quantum physics
Quantum physics
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A short quiz about Quantum physics for first year A level students #quantumphysics
Flashcards
20 cards
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Questions
20
Answers
1
When a photon is produced in an LED,
it always looks green
the photon energy equals the electron energy loss
the photon energy is always about 2 eV
the photon energy is more than the electron energy loss
2
Which are other conclusions from electron diffraction through a solid ?
the atoms are arranged in a lattice
the gaps between atoms are similar size to the electron wavelength
electrons have long wavelengths
solids are complex
3
What does the word 'Quantum' mean ?
A large step
a value of something
a short Bond movie
a small piece
4
Which effect does NOT need the Quantum theory to explain it ?
the ammeter
The Periodic Table
superconductivity
the laser
5
A photon's energy is inversely proportional to its wavelength
true
false
6
A metal with a higher work-function will have a lower threshold frequency
true
false
7
the electron-volt is a handy sized unit of
momentum
p.d.
wavelength
energy
8
What is Max Planck's formula for the photon energy
E = hf
D = ef
y=mx+c
E = h/f
9
The number of photons in a pulse of light is given by
hc/λ
looking it up on the side of the laser
the photon energy / pulse energy
the pulse energy / photon energy
10
The threshold frequency for a metal is
The frequency at which a photon turns into an electron
the minimum frequency of light where electrons are released
The maximum frequency of light where electrons are released
The maximum frequency an electron can stand before screaming
11
On a graph of electron energy KE against frequency, the work-function is given by
the area under the graph
the y intercept
the gradient
the x intercept
12
The minimum energy to remove an electron from a metal is known as
the electron potential
the work-function
the ionisation energy
the work-out
13
The Photo-electric Effect proved that
Einstein was very clever
Light is made from photons
Electrons can be created
Light really is a wave
14
A green LED may not turn on when a red LED does because
the green one needs a higher current
green photons are rarer
green photons have a higher energy
it is not hot enough
15
The evidence that particles are wave-packets is
electron diffraction
Young's slits expt
particle packets in shops
the Photoelectric Effect
16
When was the Quantum theory developed ?
1660s
1840s
1970s
1920s
17
On a graph of electron KE against frequency, the Planck constant is
the x intercept
the area under the graph
the y intercept
the gradient
18
Einstein's explanation of the Photoelectric Effect said
Photon energy = work function + electron KE
electron energy = QV
the electron has the leftover energy
Work function = electron KE + photon energy
19
The quantum of Electromagnetic radiation is
The photon
the plankon
The electron
The proton
20
de Broglie suggested that
all particles have a wavelength
french electrons are better
particles always diffract
electrons can wave
