InterviewSolution

Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

51.	Intensity is different for different angles of scattering in the Davisson – Germer experiment.(a) True(b) FalseThe question was asked during an online exam.Origin of the question is Davisson and Germer Experiment topic in portion Dual Nature of Radiation and Matter of Physics – Class 12
Answer» Right OPTION is (a) TRUE The best I can explain: Yes, this statement is true. When the graphs are drawn SHOWING the VARIATION of intensity of the scattered electrons with the angles of scattering at different accelerating voltages, it is found that the intensity is different for different angles of scattering.

52.	Photons of energy 10.25 eV fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 5.0 eV. What is the stopping voltage required for these electrons?(a) 10 V(b) 4 V(c) 8 V(d) 5 VThis question was addressed to me in an online interview.Asked question is from Particle Nature of Light : The Photon in section Dual Nature of Radiation and Matter of Physics – Class 12
Answer» Correct option is (d) 5 V Easy explanation: The required equation is given as: Stopping voltage = \(\frac {K_{max}}{e}\). \(\frac {K_{max}}{e} = \frac {5.0 EV}{e}\) \(\frac {K_{max}}{e}\) = 5.0 V Therefore, the stopping POTENTIAL = 5 V.

53.	Which theory is confirmed by the Davisson – Germer experiment?(a) de – Broglie theory(b) Newton’s theory(c) Einstein’s theory(d) Planck’s theoryThe question was asked during an interview for a job.My question is taken from Davisson and Germer Experiment in division Dual Nature of Radiation and Matter of Physics – Class 12
Answer» Correct answer is (a) DE – Broglie theory Best explanation: Davisson and GERMER experiment proves the concept of wave NATURE of matter particles. The Davisson–Germer experiment provides a critically important confirmation of the de-Broglie HYPOTHESIS, which said that particles, such as electrons, are of dual nature.

54.	If the intensity of incident radiation in a photo-cell is increased, how does the stopping potential vary?(a) Increases(b) Remains the same(c) Decreases(d) InfiniteI have been asked this question in an international level competition.My question is taken from Einstein’s Photoelectric Equation : Energy Quantum of Radiation in chapter Dual Nature of Radiation and Matter of Physics – Class 12
Answer» The CORRECT choice is (b) Remains the same To EXPLAIN I WOULD say: There is no effect on stopping potential. The INTENSITY of incident radiation is INDEPENDENT of stopping potential. Therefore, even if the incident radiation in a photo-cell is increased, the stopping potential remains unchanged.

55.	Which theory of light is wave theory or particle theory?(a) Dynamic physics(b) Static physics(c) Quantum mechanics(d) de – Broglie hypothesisThis question was addressed to me by my college professor while I was bunking the class.My question is from Photoelectric Theory and Wave Theory of Light topic in section Dual Nature of Radiation and Matter of Physics – Class 12
Answer» Correct choice is (c) Quantum MECHANICS Easiest EXPLANATION: The ESSENTIAL theory of LIGHT was further evolved from electromagnetics into quantum mechanics. Einstein believed light is a particle, i.e. a photon and that the flow of these PARTICLES (photons) is a wave.

56.	Who is responsible for the photoelectric effect experiment?(a) Albert Einstein(b) Max Planck(c) Heinrich Hertz(d) de – BroglieThe question was asked in unit test.The question is from Experimental Study of Photoelectric Effect in portion Dual Nature of Radiation and Matter of Physics – Class 12
Answer» The correct option is (c) Heinrich Hertz The best I can EXPLAIN: German physicist Heinrich Rudolf Hertz discovered the photoelectric effect in 1887 when he was working in connection with his work on RADIO waves. During this time, Hertz observed that, when ULTRAVIOLET light shines on two metal electrodes with a voltage applied across them, the light changes the voltage at which sparking takes PLACE. This LED to his discovery of the photoelectric effect experiment.

57.	Pick out the apparatus used in the experiment of the photoelectric effect from the following.(a) Electron gun(b) Vacuum tubes(c) Metal tubes(d) Glass tubesThis question was addressed to me in an online quiz.This key question is from Experimental Study of Photoelectric Effect topic in portion Dual Nature of Radiation and Matter of Physics – Class 12
Answer» Right choice is (d) GLASS tubes Easiest explanation: The apparatus used in the experiment of the photoelectric EFFECT involves an evacuated glass tube. Two metal electrodes, a COLLECTOR, and a metal plate are enclosed in this glass tube. This glass tube is provided with a side quartz window. The metal plate acts as the PHOTOELECTRON emitter.

58.	If the wavelength of electromagnetic radiation is doubled, what will happen to the energy of photons?(a) Remains the same(b) Doubled(c) Halved(d) InfiniteI have been asked this question by my college director while I was bunking the class.I'm obligated to ask this question of Photoelectric Effect in section Dual Nature of Radiation and Matter of Physics – Class 12
Answer» Right choice is (c) Halved The best I can explain: Energy of a PHOTON is given as: E = hv = \(\frac {HC}{\lambda}\) The energy of the photon reduces to one-half when the wavelength of RADIATION is doubled.