Скачать или смотреть A playground merry-go-round of radius 2 m. Rotational Dynamics ⚡| NEB-Physics -12 Important Question

In text Question:-
A playground merry-go-round with a radius of 2.0 m has a moment of inertia of 250 kgm² and is rotating at 10rev/min. A 25 kg child jumps onto the edge of the merry-go-round. What is the new angular speed of the merry-go-round?
Important Questions for 2083 Batch
Modern Physics:
Describe with necessary theory, Millikan's oil drop experiment to determine
the value of the charge associated with an electron.
68. Show that the motion of an electron in magnetic field is circular. Prove that frequency and time period are independent with the velocity of an electron.
69. What is specific charge of an electron? Describe and give necessary theory of J.J. Thomson's method to determine the specific charge of an electron.
70. What is photoelectric effect? Derive Einstein’s photoelectric equation; define various terms used in it.
71. Describe Millikan's experiments to verify Einstein's photoelectric equation
and hence determine the value of Plank’s constant.
72. What is an extrinsic semiconductor? Explain the formation of potential
barrier and depletion region in a p-n junction diode.
73. Explain with neat diagram, the working mechanism of a full wave rectifier
using junction diodes. How the output changes when a filter circuit is used?
74. What if junction diode? Explain its working as half wave rectifier.
75. What is Zener breakdown? Describe how a Zener diode can be used as a voltage regulator?
76. What are Bohr's postulates of hydrogen atom? Derive an expression for the radius of Bohr's nth orbit.
77. Starting from Bohr's postulates, obtain an expression for the energy of the electron in nth orbit of the hydrogen atom.
78. Describe the modern method of productions of X-rays. Discuss crystal
diffraction.
79. Derive Bragg's law and explain how this law is used to determine the crystal plane spacing.
80. State laws of radioactive disintegration and show that the number of atoms of a given radioactive substance decreases exponentially with time. Also, derive a relation between decay constant and half-life of a radioactive
substance.
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