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This MCQ is based on the Dual Nature of Radiation and Matter which includes Electronic Emission, Photoelectric Effect, Laws Of Photoelectric Effect, De Broglie Hypothesis, De Broglie-Bohm Theory, Heisenberg’s Uncertainty Principle, Planck’s Quantum Theory, and many more.
The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1 MeV energy is nearly
When the light of frequency 2v0 (where v0 is threshold frequency) is incident on a metal plate, the maximum velocity of electrons emitted is v1. When the frequency of the incident radiation is increased to 5v0, the maximum velocity of electrons emitted from the same plate is v2. The ratio of v1 to v2 is:
The photoelectric threshold wavelength of silver is 3250 × 10^-10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10^-10 m is: (Given h = 4.14 × 10^-15 eVs and c = 3 × 10^8 m s-1)
A particle is dropped from a height H. The de-Broglie wavelength of the particle as a function of height is proportional to
When an electron jumps across a potential difference of 1 V, it gains energy equal to :
Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?
Calculate the kinetic energy of a photoelectron (in eV) emitted on shining light of wavelength 6.2 × 10^-6 m on a metal surface. The work function of the metal is 0.1 eV.
For a photosensitive surface, the work function is 3.3 × 10^-19 J. Calculate the threshold frequency.
The stopping potential in an experiment on the photoelectric effect is 1.5 V. What is the maximum kinetic energy of the photoelectrons emitted?
The maximum kinetic energy of a photoelectron is 3 eV. What is the stopping potential?
If the intensity of the radiation incident on a photo-sensitive plate is doubled, how does the stopping potential change?
In Thomson’s experiment number of parabola gives :
The no. of electrons present in element
The no. of proton present in element
The no. of neutrons present in element
The no. of isotopes of the element present
The strength of photoelectric current depends upon :
Angle of incident radiation
Frequency of incident radiation
Intensity of incident radiation
Distance between anode and cathode
Kinetic energy of emitted electrons depends upon :
Frequency
Intensity
Nature of atmosphere surrounding the electrons
None of these
Compared to liquids and solids, gases are:
Good conductors of electricity
Best conductors of electricity
Very poor conductors of electricity
Good or bad conductors of electricity depending upon the nature of the gas
The different stages of discharge in a discharge tube can be explained on the basis of:
The wave nature of light
The dual nature of light
Wave nature of electrons
The collision between the charged particles emitted from the cathode the atoms of the gas in the tube
The ratio of specific charge of an alpha particle to the proton is:
1 : 2
2 : 1
4 : 1
1 : 4
A proton, a neutron, an electron and an a-particle have same energy. Then their de-Broglie wavelengths compare as
λp = λn > λe > λa
λα < λp = λn < λe
λe < λp = λn > λa
λe = λp = λn = λa
which Characteristic of a target does the Mosley’s law relate the frequency of X-rays?
Density
Atomic number
Atomic weight
Interatomic space
Evidence of the wave nature of light cannot be obtained from:
Diffraction
Interference
Doppler effect
Reflection
