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WorksheetsPhotoelectric Effect and Quantum Physics
Total questions: 40
Worksheet time: 44mins
A particle of light is called a...
Photoelectron
Photon
Proton
Electron
The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light
Intensity
Wavelength
Frequency
Energy
What color of light has the greatest energy per photon?
Red
Green
Blue
Violet
The energy of photoelectrons emitted from a metal surface can be increased by
using light of higher frequency.
using light of longer wavelength.
using light of higher intensity.
using monochromatic, polarized light.
What is the best description of 'threshold frequency'?
The minimum energy needed for electrons to escape a surface.
The maximum kinetic energy that an emitted electron has.
The minimum frequency of a photon that will cause an electron to be emitted.
The frequency that an emitted electron will have.
Photoelectric effect provides the evidence for the ______ nature of radiation.
dual
wave
particle
electromagnetic
If the brightness of a beam of light increases without changing its color, the ______ will increase.
number of photons
frequency of the light
energy of the photons
wavelength of the photons
What is the energy, in eV, of a photon that has a wavelength of 620 nm?
1eV
2eV
3eV
4eV
The energy of a photon is directly proportional to its _____ and inversely proportional to its ______.
intensity - speed
wavelength - frequency
frequency - wavelength
intensity - wavelength
Use the graph to find the threshold frequency.
−12×10-19 Hz
0 Hz
2×1015 Hz
4×1015 Hz
A metal with a work function of 3.5 eV is exposed to photons with an energy of 3.7 eV. What is the maximum kinetic energy of the emitted photoelectrons?
0.2 eV
0.9 eV
1.1 eV
7.7 eV
What is the energy of a photon with a frequency of 5x1014 Hz? (you need to do calculation. You have enough time)
2.5x10-19 J
3.0x10-19 J
3.3x10-19 J
4.5x10-19 J
What is the energy of a photon with a frequency of 5x1014 Hz? (you need to do calculation. You have enough time) h=6.6x10-34 J/Hz
2.5x10-19 J
3.0x10-19 J
3.3x10-19 J
4.5x10-19 J
What is the relationship between the frequency of a light wave and its wavelength?
Frequency is the square of the wavelength
Frequency is inversely proportional to the wavelength
Frequency is directly proportional to the wavelength
Frequency is unrelated to the wavelength
What happens when ultraviolet light is shone on a negatively charged zinc plate?
The zinc plate emits protons
The zinc plate becomes positively charged
Electrons are emitted from the zinc
The zinc plate gains more electrons
What is the unit of energy used to describe the energy of photons?
Electron volts
Joules
Hertz
Watts
What is the energy of a photon equal to?
Its wavelength divided by Planck’s constant
Its wavelength multiplied by its speed
Its frequency multiplied by Planck’s constant
Its speed divided by its frequency
What did Albert Einstein propose about electromagnetic radiation?
It has no properties
It behaves only as a particle
It behaves only as a wave
It displays properties of both particles and waves
What is the significance of the photoelectric effect in quantum theory?
It supports the wave theory of light
It supports the particle theory of light
It disproves the wave theory of light
It disproves the particle theory of light
The SI unit of frequency is the __________.
meter
second
hertz
meter per second
True or False? The wavelength and frequency of all waves are inversely proportional to each other.
True
False
When the green laser is shone onto a metal surface electrons are released
What did Max Planck suggest as the solution to the problem of the black Body Curve not fitting in well with the wave theory?
Energy is quantized
Intensity increases infinitely
Electrons are released by light
Increasing the wavelength
The arrows in this diagrams depict...
Emission of light energy
Absorption of light energy
Absorption and Emission of light energy
Neither absorptions and emission of light energy
The arrows in this energy diagram depict...
Absorption of light energy because the arrows are pointed up.
Emission of light energy because the arrows are pointed up.
Absorption of light energy because the arrows are pointed down
Emission of light energy because the arrows are pointed down
Which are absorption arrows?
a, b, c, d
e, f, g, h
a, e, b
d, c, h
Which arrow indicates absorption of the LONGEST WAVELENGTH? (hint: how do energy and wavelength relate?)
h
e
a
d
Which arrow indicates Absorption of the SHORTEST WAVELENGTH? (hint: how do energy and wavelength relate?)
h
e
a
d
What is the term used to describe the fact that particles can behave as waves and waves can behave as particles?
wave-particle disparity
wave-particle tranquality
wave-particle equality
wave-particle duality
Which of the following colors of visible light has the lowest frequency?
blue
green
yellow
red
violet
Which of the following colors of visible light has the longest wavelength?
Blue
Green
Yellow
Red
Violet
Which color of light moves at the fastest speed?
blue
green
yellow
red
All light travels at the same speed.
All electromagnetic waves...
travel at the speed of light
can be reflected
can exhibit interference
all of the above
Which of the following colors of visible light has the highest frequency?
Blue
Green
Orange
Red
Violet
