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Define the term 'intensity of radiation' in terms of photon picture of light.
Concept: Experimental Study of Photoelectric Effect
Write Einstein’s photoelectric equation?
Concept: Einstein’s Photoelectric Equation: Energy Quantum of Radiation
Write two important limitations of Rutherford's nuclear model of the atom.
Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
Write two important characteristics of equipotential surfaces.
Concept: Equipotential Surfaces
Define the coefficient of self-induction.
Concept: Inductance >> Self Inductance
A series LCR circuit is connected across an a.c. source of variable angular frequency 'ω'. Plot a graph showing variation of current 'i' as a function of 'ω' for two resistances R1 and R2 (R1 > R2).
Answer the following questions using this graph :
(a) In which case is the resonance sharper and why?
(b) In which case in the power dissipation more and why?
Concept: AC Voltage Applied to a Series LCR Circuit
State two points of difference between the interference patterns obtained in Young’s double slit experiment and the diffraction pattern due to a single slit.
Concept: Diffraction of Light >> The Single Slit
Answer the following question.
Show that the density of the nucleus is independent of its mass number A.
Concept: Size of the Nucleus
Write the two processes that take place in the formation of a p-n junction.
Concept: Diode or p-n Junction
Write the property of a junction diode which makes it suitable for rectification of ac voltages.
Concept: Semiconductor Diode
What is the function of a 'Repeater' used in communication system?
Concept: Basic Terminology Used in Electronic Communication Systems
"The outward electric flux due to charge +Q is independent of the shape and size of the surface which encloses is." Give two reasons to justify this statement.
Concept: Electric Flux
Find the equivalent capacitance of the network shown in the figure, when each capacitor is of 1 μF. When the ends X and Y are connected to a 6 V battery, find out (i) the charge and (ii) the energy stored in the network.
Concept: Capacitors and Capacitance
Derive an expression for drift velocity of free electrons.
Concept: Drift of Electrons and the Origin of Resistivity
Distinguish between emf and terminal voltage of a cell.
Concept: Cells, EMF, and Internal Resistance
Explain the term ‘drift velocity’ of electrons in conductor. Hence obtain the expression for the current through a conductor in terms of ‘drift velocity’.
Concept: Drift of Electrons and the Origin of Resistivity
Answer the following question.
A cell of emf E and internal resistance r is connected across a variable resistor R. Plot the shape of graphs showing a variation of terminal voltage V with (i) R and (ii) circuit current I.
Concept: Cells, EMF, and Internal Resistance
Obtain the expression for current sensitivity of moving coil galvanometer.
Concept: Moving Coil Galvanometer
Two infinitely long straight parallel wires, '1' and '2', carrying steady currents I1 and I2 in the same direction are separated by a distance d. Obtain the expression for the magnetic field `vecB`due to the wire '1' acting on wire '2'. Hence find out, with the help of a suitable diagram, the magnitude and direction of this force per unit length on wire '2' due to wire '1'. How does the nature of this force changes if the currents are in opposite direction? Use this expression to define the S.I. unit of current.
Concept: Force Between Two Parallel Currents (Ampere’s Law)
Increasing the current sensitivity of a galvanometer may not necessarily increase its voltage sensitivity. Explain, giving reason.
Concept: Moving Coil Galvanometer
