17 November 2025
13 August 2025
Atomic and Nuclear Physics UNIT - III Lecture notes
Unit - III: RADIOACTIVITY: Discovery of radioactivity – natural radio activity – properties of alpha rays, beta rays and gamma rays – GeigerNuttal law – alpha particle spectra –Gammow's theory of alpha decay (qualitative study) – beta ray spectra – neutrino theory of beta decay – nuclear isomerism – internal conversion – nonconservation of parity in weak interactions.
Atomic and Nuclear Physics UNIT - II Lecture notes
Unit - II: ATOMIC SPECTRA: Origin of atomic spectra – excitation and ionization potentials – Davis and Goucher's method – spectral terms and notations – fine structure of sodium D-lines – Zeeman effect – Larmor's theorem – quantum mechanical explanation of normal Zeeman effect – anomalous Zeeman effect (qualitative explanation) –Paschen-Back effect – Stark effect.
Atomic and Nuclear Physics UNIT - I Lecture notes
UNIT - I: VECTOR ATOM MODEL: Introduction to atom model – vector atom model – electron spin –spatial quantisation– quantum numbers associated with vector atom model – L-S and J-J coupling – Pauli's exclusion principle – magnetic dipole moment due to orbital motion and spin motion of the electron – Bohr magnetron – Stern-Gerlach experiment – selection rules – intensity rule.
21 October 2024
17 October 2024
Mechanics Problem No. 3
PROBLEM NO. 3 (UG NEET 2023)
A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by it is:
a) 6.28s b) 3.14s c) 0.628s d) 0.0628s
15 October 2024
Problems in Mechanics
Problem : 1 (UG NEET 2024)
14 October 2024
13 October 2024
09 October 2024
1. Ultrasonic waves are:
a) Longitudinal
b) Progressive
c) Transverse
d) Stationary
2. The sharpness of the resonance curve is influenced by:
a) Mechanical energy loss
b) Frictional energy loss
c) Potential energy loss
d) Kinetic energy loss
3. The phon is a unit used to measure the:
a) Intensity of sound
b) Loudness of sound
c) Phase of sound
d) None of the above
4. In simple harmonic motion (SHM), the velocity at the equilibrium position is:
a) Minimum
b) Constant
c) Zero
d) Maximum
5. The decibel scale is useful for measuring voltages across:
a) A wide frequency ratio
b) A wide voltage ratio
c) A narrow frequency range
d) A narrow voltage range
6. When the X and Y plates of a CRO are connected to unequal voltages of equal frequency with a 90-degree phase shift, the resulting Lissajous figure will be:
a) A circle
b) A straight line
c) An ellipse
d) A figure-of-eight
7. If the length of a sonometer wire is halved, the resonance frequency will:
a) Triple
b) Be halved
c) Quadruple
d) Double
8. In Melde’s experiment (transverse mode), the ratio of the frequency of the tuning fork to the frequency of the waves in the string is:
a) 1:1
b) 2:1
c) 1:2
d) 4:1
9. Which of the following is not considered an acoustical defect in a room?
a) Reverberation
b) Echo formation
c) Absorption
d) Sound focusing
10. Echo formation occurs when the reflecting surface is located at a distance greater than:
a) 7 meters
b) 10 meters
c) 13 meters
d) 17 meters
INTRODUCTORY PHYSICS (SPHPF11) – NOVEMBER 2023 MCQ QUESTIONS
1. Which of the following is the fundamental
quantity?
a) volume b)
time c)
velocity d) force
2. Therm is the unit of ______
a) power
b) heat c) light d)
distance
3. When no external torque acts on a system,
_________ is conserved.
a) energy b)
force c) angular momentum d)
linear momentum
4. The strongest force in nature is _____
a) gravitational force b) electrostatic force c)
magnetic force d) nuclear force
5. Potential energy and kinetic energy are the types
of _____ energy.
a) thermal
b) electrical c) mechanical d)
magnetic
6. Angular momentum is a ______ quantity.
a) scalar
b) vector c) both scalar and vector d)
none
7. Orbital velocity of a satellite is dependent on
the mass of _________
a) satellite b)
earth c) radius d)
altitude of the satellite
8. The coefficient of restitution e = 1 is for
______
a) perfectly
elastic b) perfectly inelastic c) both elastic and inelastic d) none
9. The rise of a liquid in a capillary tube is due
to _________
a) surface
tension b) water c) osmosis d) diffusion
10. The unit of electric field is _______
a) volts per
metre b) volt c) metre d) coulomb