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WorksheetsLight Waves and Photons
Total questions: 20
Worksheet time: 10mins
The electron volt is a measure of
charge
velocity
electric potential
momentum
energy
Which of the following is true about the momentum of photons?
Photons have no rest mass, so they have no momentum.
The momentum of a photon is directly proportional to its energy.
The momentum of a photon is inversely proportional to the square root of its frequency.
Photons all travel at the speed of light, so they all have the same momentum.
The momentum of a photon is directly proportional to its wavelength.
Photoelectrons will be ejected from a material surface if?
The threshold frequency is greater than the photon frequency
The work function is less than the photon energy
The intensity of light is high enough
The wavelength of photon is maximum
A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.
4.2 eV
4.4 eV
4.7 eV
4.9 eV
In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons
Will not be ejected
Will be ejected as observed in the previous
Will be ejected with greater number of photoelectrons
Will be ejected with greater kinetic energy
A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?
More electrons are emitted in a given time interval
Fewer electrons are emitted in a given time interval
Emitted electrons are more energetic
Emitted electrons are less energetic
A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the light intensity is increased (without changing λ ), what is the result?
More electrons are emitted in a given time interval
Fewer electrons are emitted in a given time interval
Emitted electrons are more energetic
Emitted electrons are less energetic
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
Which of the following colors of visible light has the highest frequency?
Blue
Green
Orange
Red
Violet
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.
Wave -particle duality is supported by...
electrons behaving as particles with ordinary matter
electrons behaving as waves when travelling through space
the photo electric effect
all of the above
Planck's constant can be found ...
energy of a particle x speed of light / wavelength
energy of a particle x speed of light / frequency of light
energy of a particle x wavelength / speed of light
slope of the cut-off voltage vs frequency graph
the minimum frequency for which the photoelectric effect can occur is called the
absolute frequency
cut off frequency
Lyman frequency
threshold frequency
De Broglie equation
relates the momentum of a mass to its wavelength
relates the energy of a mass to its wavelength
relates the frequency of a mass to its wavelength
relates the work function of a mass to its wavelength
The energy of an emitted photon can be calculated from ...
Plancks constant x frequency of the photon
h x c / wavelength of the light emitted
the difference in the energy levels
all of the above
When light of specific frequencies is shined on a surface, electrons are ejected from the surface. This is the idea behind...
Quantization of Energy
Photoelectric Effect
Compton Effect
deBroglie Waves
Uncertainty Principle
