Origin Of Quantum Mechanics (MSQ) - Physics MCQ

No photocurrent till the incident frequency reaches the minimum frequency required to overcome the work function of the metal φ

i.e. hv_in = φ 

After that, any increase in the frequency will not increase the photocurrent because the incident light has the same intensity.

Whereas KE_max 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)

From the quantization of orbital angular momentum,

For energy,
Centrifugal force = Coulomb attraction

The correct answers are: 

The correct answers are:  

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

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 (v_in), The scattered radiation contains X-rays of wavelength same as that of incident wavelength and larger than the incident wavelength

E = hv = E_f – E_in

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

= –6.0 eV
The correct answers are: E_f = –6.0 eV, n_f = 3