3 Dual Nature NCERT Board MCQ Video 3 скачать в хорошем качестве

3 Dual Nature NCERT Board MCQ Video 3

Dual Nature of matter and radiations NCERT Board MCQ , Dual Nature of Radiation and Matter | NCERT MCQs | CBSE Class 12 Physics In this video, we solve important NCERT-based MCQs from Dual Nature of Radiation and Matter for CBSE Board Exams. Perfect for board exams, term tests, and competitive exams like NEET & JEE (Basics). Topics covered: • Photoelectric Effect • Einstein’s Photoelectric Equation • Threshold Frequency & Work Function • de Broglie Wavelength • Wave-Particle Duality Time line: 00:00 Question-41 The de Broglie wavelength of an electron in a metal at 270C is 01:44 Question-43 Two particles A1 and A2 of masses m1 , m1 , have the same de Broglie wavelength. Then 03:25 Question-44 A student performs an experiment on photoelectric effect using two materials A and B. A plot of stopping potential 05:05 Question-45 A and B are two metals with threshold frequencies 1.8 x 1014 Hz and 2.2 x 1014 Hz. Two identical photons of energy 0.825 eV each are incident on them. Then photoelectrons are emitted in 06:43 Question-46 An electron mass m, an initial velocity it is in an electric field. If, it’s de Broglie wavelength at time t is given by 08:56 Question-47 The maximum frequency and minimum wavelength of X-rays produced by 30 kV electrons respectively is 10:21 Question-48 If the kinetic energy of the particle is increased by 16 times, the percentage change in the de Broglie wavelength of the particle 11:54 Question-49 If an electron and a photon propagate in the form of waves having same wavelength, it implies that they have same: 12:26 Question-50 Light of wavelength 0.6 m from a sodium lamp falls on a photocell and causes the emission of photoelectrons for which the stopping potential is 0.5 V. With light of 14:44 Question-51 The rest mass of photon is 14:52 Question-52 A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 × 106 m/s. The velocity of the particle is 16:13 Question-53 The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes 16:52 Question-54 The work function for Al, K and Pt is 4.28 eV 2.30 eV and 5.65 eV respectively. Their respective threshold frequencies would be 17:49 Question-55 Sodium surface is illuminated by ultraviolet and visible radiation successively and the stopping potential is determined. This stopping potential is 19:03 Question-56 Assume that a molecule is moving with the root mean square speed at temperature 300 K. The de-Broglie wavelength of nitrogen molecule is 20:57 Question-57 According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is 21:50 Question-58 The photoelectric cut off voltage in a certain experiment is 1.5 V. The maximum kinetic energy of photoelectrons emitted is 22:29 Question-59 A metallic plate exposed to white light emits electrons. For which of the following colours of light, the stopping potential will be maximum? 23:17 Question-60 A graph is plotted between the stopping potential on y-axis and the frequency of incident radiation 24:15 Question-61 If photons of frequency are incident on two surfaces of two metals, A and B of threshold frequencies 25:24 Question-62 A photocell connected in an electrical circuit is placed at a distance d from a source of light. As a result, current I flows in the circuit. What will be the current in the circuit when the distance is reduced to 26:40 Question-63 The kinetic energy of a proton and that of an -particle are 4 eV and 1 eV respectively. The ratio of the de-Broglie wavelengths associated with them will be