Origin Of Quantum Mechanics (MSQ)
10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Origin Of Quantum Mechanics (MSQ)
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The dispersion law for a certain type of wave motion is ω = (c2k2 + m2)1/2 where ω is the angular frequency, k is the magnitude of the propagation vector and c, m are constants. The group velocity of these waves approaches :
In the photoelectric effect experiment we use a source of light whose frequency can be varied. If we gradually increase the frequency of the incident light then :
No photocurrent till the incident frequency reaches the minimum frequency required to overcome the work function of the metal φ
i.e. hvin = φ
After that, any increase in the frequency will not increase the photocurrent because the incident light has the same intensity.
Whereas KEmax increase linearly with the frequency of the incident radiation.
The correct answers are: Photoelectric effect observed (after some time) with photocurrent remaining constant., Photoelectric effect observed after some time with the maximum kinetic energy (KE) of electron varying (increasing with time)
In case of an one electron Bohr atom, pn is the linear momentum of the electron in the nth orbit and En is its total energy. Which of the following is true? Here rn is the radius of the nth orbit and m is the mass.
From the quantization of orbital angular momentum,
For energy,
Centrifugal force = Coulomb attraction
The correct answers are: 
For single electron atom with orbital angular momentum 
which of the following can be the possible values of a measurement of Lz. (z component of L)?
The correct answers are: 
For the photoelectric effect, stopping potential v/s incident frequency is plotted. Choose the correct statements.
For photoelectric effect,
Compare with y = mx + c
The correct answers are: the graph is a straight line with a positive slope and negative y intercept., slope
The kinetic energy of electrons ejected from the surface of a metal ranges from :
Correct Answer :- a
Explanation : In the photoelectric effect, each photon donates all of its energy hf to an electron in the metal. If this process occurs at the metal surface, the electron is released into the vacuum with a kinetic energy given by:
Kmax = hf - phi
The correct answers are: Interference and Diffraction are manifestations of wave nature of light., Photoelectric and compton effects are manifestations of particle nature of light.
Refer the theory of compton effect λ
The correct answers are: The scattered radiation contains X-rays of the incident frequency and frequency smaller than the incident frequency (vin), The scattered radiation contains X-rays of wavelength same as that of incident wavelength and larger than the incident wavelength
Which of the following is true about the absorption and emission of energy by an atom?
E = hv = Ef – Ein
The frequency can only corresponds to the difference in two energy states.
The correct answers are: An atom can only absorb photons that have certain specific energies., An atom can emit photons of only certain specific energies., At low temperatures, the lines in the absorption spectrum of an atom coincide with the lines in its emission spectrum that represent transitions to the ground slate
A singly ionized Helium atom in n = 4 state emits a photon of wavelength 470nm. If Ef is the final state energy and nf is the principal quantum number of the final state then :
= –6.0 eV
The correct answers are: Ef = –6.0 eV, nf = 3
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