# PPSC Lecturer of Physics Online Test 37 Past Papers

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 Test Instructions:- Test Name Lecturer Physics Subject Physics Test 37 Test Type MCQs Total Questions 25 Total Time 20 Minutes Total Marks 100
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You have 20 minutes to pass to the quiz.

You have 20 minutes to pass to the quiz.

PPSC Lecturer of Physics Test 37

1 / 25

In Compton scattering from stationary electrons the frequency of the emitted light is independent of:

2 / 25

In a photoelectric effect experiment no electrons are ejected if the frequency of the incident light is less than A/h, where h is the Planck constant and A is:

3 / 25

The radial probability density for the electron in the ground state of a hydrogen atom has a peak at about:

4 / 25

The stopping potential for electrons ejected by 6.8×1014-Hz electromagnetic radiation incident on a certain sample is 1.8V. The kinetic energy of the most energetic electrons ejected and the work function of the sample, respectively, are:

5 / 25

Of the following, Compton scattering from electrons is most easily observed for:

6 / 25

Evidence for the wave nature of matter is:

7 / 25

In a photoelectric effect experiment at a frequency above cut off, the number of electrons ejected is proportional to:

8 / 25

Rank following electromagnetic radiations according to the energies of their photons, from least to greatest:
1. blue light
2. yellow light
3. x rays

9 / 25

In Compton scattering from stationary particles the maximum change in wavelength can be made smaller by using:

10 / 25

Which of the following electromagnetic radiations has photons with the greatest energy?

11 / 25

Of the following which is the best evidence for the wave nature of matter?

12 / 25

Electromagnetic radiation with a wavelength of 5.7×10−12 m is incident on stationary electrons. Radiation that has a wavelength of 6.57 × 10−12 m is detected at a scattering angle of:

13 / 25

Which of the following electromagnetic radiations has photons with the greatest momentum?

14 / 25

In a photoelectric effect experiment at a frequency above cut off, the stopping potential is proportional to:

15 / 25

The units of the Planck constant h are those of:

16 / 25

Separate Compton effect experiments are carried out using visible light and x rays. The scattered radiation is observed at the same scattering angle. For these experiments:

17 / 25

The quantization of energy, E = nhf, is not important for an ordinary pendulum because:

18 / 25

Light beams A and B have the same intensity but the wavelength associated with beam A is longer than that associated with beam B. The photon flux (number crossing a unit area per unit time) is:

19 / 25

A photon in light beam A has twice the energy of a photon in light beam B. The ratio pA/pB of their momenta is:

20 / 25

In Compton scattering from stationary electrons the largest change in wavelength occurs when the photon is scattered through:

21 / 25

In a photoelectric effect experiment the stopping potential is:

22 / 25

The frequency of light beam A is twice that of light beam B. The ratio EA/EB of photon energies is:

23 / 25

Which of the following is NOT evidence for the wave nature of matter?

24 / 25

The wavelength of light beam B is twice the wavelength of light beam B. The energy of a photon in beam A is:

25 / 25

If h is the Planck constant, then ¯h is: