NEW
Font size
WorksheetsPhysics: Quantum
Total questions: 20
Worksheet time: 10mins
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
A discrete amount of energy of electromagnetic radiation is called
Wave
Photon
Planck's Constant
Quantum
Light is ejected from the surface of a metal when light of sufficient energy is incident on it. This phenomenon is known as?
Photo-electric effect
Photon absorption emission
Emission of light
Wave particle duality
Theoretically, Photon energy of light is the sum of Work function of a metal and________
Maximum potential energy of electrons due to height reached after emission
Minimum kinetic energy of electrons emitted
Maximum kinetic energy of emitted electrons.
Maximum workdone in ejecting the electron and the electron de-exciting
The X-intercept of an Ekmax against frequency graph is?
Planck's Constant
Work function
Wavelength
Threshold frequency
The y-ntercept of an Ekmax against frequency graph is?
Work function
Planck's Constant
Threshold wavelength
Threshold frequency
For photo electric effect, the gradient of a Velocity against frequency graph is?
2h
2h/f
2h/fo
2h/m
Photo electric effect will occur if and only if
Frequency of light is greater than threshold frequency
Frequency of light is equal to threshold wavelength
Wavelength of light is extremely long
Wavelength of light is equal to the atomic spacing of the metal
The Planck's Constant relates
Energy with frequency
Speed of light with energy
Frequency with the speed of light.
Wavelength with energy
The gradient of an Ekmax against frequency graph is?
Threshold frequency
Planck's Constant
Wavelength
Work function
Light incident on a metal surface is found to eject electrons at a particular when It has sufficient energy. This minimum energy is referred to as
Work function
Threshold wavelength
Maximum frequency
Maximum kinetic energy
De Broglie's hypothesis explains
the wave-particle duality
Planck's Constant
The two quantities involved in the Broglie's hypothesis that explains the wave nature and the particle nature of light is?
Momentum and Wavelength
Momentum and kinetic energy
Planck's Constant and mass
Kinetic energy and momentum
In electron diffraction experiment, the pattern firmed in the screen is
Concentric circles
Spiral circles
Eccentric circles
Sodium metal has a work function of 2.3ev. calculate the threshold frequency.
h= 6.63 x 10-34 Js
1ev = 1.6 x 10-19J
5.6 x 10-14
5.6 x 10 14
5.6 x 10 12
5.6 x 10 15
Wave theory of light suggests that electrons are emitted at all frequency. Is this phenomenon true for photo electric effect.
Yes
No
In an electron diffraction experiment, graphite crystal is used because
The interatomic spacing of the crystal is the same order as the wavelength of the electrons
The wavelength of the electrons exceeds the graphite crystals size.
The diameter of the graphite crystals is the size of the electrons
Electrons releases energy and falls to a lower energy level. This phenomenon is known as
De- excitation
De-energizng
Excitation
Energy release
No of electrons emitted per unit time is dependent on
Intensity
Energy
Evidence of wave nature of light is
Diffraction
Transmission
Linear momentum
Force
