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WorksheetsQuantum & Laser Physics
Total questions: 50
Worksheet time: 28mins
Name the scientist who created an equation to treat the electron as a wave
Planck
Heisenberg
de Broglie
Schrodinger
Wave nature of matter was suggested by
Heisenberg
de Broglie
Davisson and Germer
Bragg
What is the photoelectric effect?
Emission of light in response to electron beam
Emission of electrons from metal in response to light
Emission of electrons in response to sound
Emission of photons in response to light
An example of photoelectric effect in everyday objects is
When you take photographs
When you use a solar powered calculator
When you turn on the heat
When you turn a light bulb on
Wave function is represented by the symbol
Ψ
£
þ
µ
Wave function in Quantum Mechanics is as similar as ....... in Classical Mechanics.
Amplitude
velocity
momentum
position
A ________ is basically the idealized version of a radiating object.
frequency
light ray
black hole
blackbody
What is the equation for Planck's Law?
Energy of a photon = Planck's constant * frequency of light
Energy of a photon = Planck's constant / frequency of light
Energy of a photon * Planck's constant = frequency of light
Energy of a photon = Planck's constant = frequency of light
Eventually these discreet packets got called ____ because of Einstein's work.
particles
blackbodies
photons
quanta
When light hits a metal plate and electrons leave the plate creating a current, this is called the ______.
particle effect
photoelectric effect
light and particle effect
photoparticle effect
What term describes how in some circumstances light can behave like a particle and other circumstances it can behave like a wave?
particle-wave schima
Planck's particle dual behavior
wave-particle duality
particle-wave behavior principle
Photoelectric Effect was first observed by Albert Einstein.
False, it was observed by Planck.
False, it was observed by Hertz in 1887.
True
None of these.
The Compton Effect is a result of ______________
radiation-radiation interaction.
particle-radiation interaction.
particle-particle interaction.
quantization of momentum.
Davisson-Germer experiment verifies __________
quantization of energy.
quantization of momenta.
uncertainty principle.
de Broglie hypothesis of matter waves.
de Broglie wavelength of an electron accelerated through 100V is ______
1.22 A0
1.42 A0
1.02 A0
12.2 A0
Which of the following statements is NOT TRUE concerning a blackbody
It absorbs radiation of all wavelengths that fall on it
It is a best emitter radiation
It's radiation is also known as cavity radiation
It reflects some radiation that falls on it
Choose the correct statement for photon
Photon is a quantum of electromagnetic wave
Photon is a particle with a positive charge
Photon is a particle with a negative charge
Photon is the electron produced when light is incident on a metal's surface
Identify the physical phenomena that cannot be described by the wave theory of light
Diffraction
Polarization
Interference
Photoelectric effect
What happens to the deBroglie's wavelength of an electron if its momentum is doubled?
The wavelength decreases by a factor of 2
The wavelength increases by a factor of 2
The wavelength decreases by a factor of 3
The wavelength decreases by a factor of 4
An iron rod is heated. The colors at different temperatures are noted. Which of the following colors shows that the iron rod is at the lowest temperature?
red
orange
white
blue
Which of the following colors of visible light has the lowest frequency?
blue
green
yellow
red
violet
Which of the following colors of light is associated with the greatest amount of energy?
blue
green
yellow
red
violet
Quantum mechanics describes the motion of ______ as waves.
very large objects such as stars and planets
everyday size objects such as cars and trucks
very tiny objects such as atoms
What is Planck's Constant?
6.626x10-34 Js
6.626x10-39 J/s
3.0x108 ms
3.0x108 m/s
Compton effect expt. is carried out with
x ray
gama ray
visible light
heat waves
In Compton effect we use X-ray because
it is easy to produce
it has very small wave length
x-ray photon has very high energy
it is a X-ray diffraction experiment
Instead of light, a TEM and SEM utilize ____________ to create an image
a colored pencil
neutrons
protons
electrons
Which of the following statements are true?
- LASER is used as optical source in single mode fibers.
- LASER lights are highly incoherent.
1. is true and 2. is false
1. is false and 2. is true
Both 1 & 2 are true
Both 1 & 2 are false
Which of the following statements are true?
- LASER is used as optical source in single mode fibers.
- LASER lights are highly incoherent.
1. is true and 2. is false
1. is false and 2. is true
Both 1 & 2 are true
Both 1 & 2 are false
Naturally occuring process in a LASER is
Stimulated Emission
Absorption
Spontaneous Emission
Population Inversion
The process in which the electrons in the ground state are vibrated to the excited states by providing extra energy from energy sources is called as
Population Inversion
Spontaneous emission
Stimulated emission
Pumping
The coherent nature of light from LASER is due to
Spontaneous emission
Stimulated Emission
Absorption
Pumping
Minimum number of energy states required to achieve population inversion is
1
2
3
4
In a LASER diode,the light output is taken from
P-layer
Active layer
N-layer
Mirror polished reflecting surface
Pump system needs to raise the atoms from...
exited state to ground state
ground state to exited state
ground state to unexcited state
excited state to exited state
Laser is a monochromatic source of light. This means all the light waves have...
same wavelength
same phase
same intensity
same direction
Population inversion means
Number of atoms in excited state are equal to the number of atoms in the ground state.
Number of atoms in excited state are more than the number of atoms in the ground state.
Number of atoms in excited state are less than the number of atoms in the ground state.
No atom in excited state.
The life time of metastable state is
smaller than the lifetime of excited state
equal to the lifetime of excited state
More than the lifetime of excited state
Zero
Einstein proved thermodynamically that
The probability of stimulated absorption is equal to the probability of stimulated emission.
The probability of stimulated absorption is equal to the probability of spontaneous emission.
The probability of stimulated emission is equal to the probability of spontaneous emission.
A source is said to be Monochromatic if
light coming from a source has only one frequency.
light coming from a source has two frequency.
Light coming from a source has multiple frequency.
CO2 laser is a type of
Solid Laser
Liquid Laser
Molecular Gas Laser
Semiconductor Laser
Pumping technique employed in gas laser is
Optical pumping
Electrical Discharge Method
Direct conversion
Chemical reaction
In which laser transition takes place between the different vibrational states of the molecule?
Ruby laser
Carbon di oxide laser
Nd-YAG laser
Semiconductor laser
Which acts as active center in CO2 laser?
N2
He
CO2
Ne
Active medium in semiconductor laser is
CO2
P-N junction diode
Helium
Neon
The wavelength of the emitted radiations depends upon the -----------------------in GaAs
Refractive Index
Band gap, concentration of donor and acceptor atoms
Current
Resistance
Pumping technique employed in semiconductor laser is -----------
Direct conversion
Optical pumping
Electrical discharge method
Chemicla reaction
