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Write two important limitations of a refracting telescope over a reflecting-type telescope.
Concept: Optical Instruments >> Telescope
Why are coherent sources necessary to produce a sustained interference pattern?
Concept: Coherent and Incoherent Sources and Sustained Interference of Light
With the help of a diagram, show how a plane wave is reflected from a surface. Hence, verify the law of reflection.
Concept: Reflection and Refraction of Plane Wave at Plane Surface Using Huygens' Principle >> Reflection of a Plane Wave by a Plane Surface
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
Derive the mathematical expression for law of radioactive decay for a sample of a radioactive nucleus
Concept: Law of Radioactive Decay
Write two important characteristics of equipotential surfaces.
Concept: Equipotential Surfaces
On what factors does the potential gradient of the wire depend?
Concept: Potentiometer
Define the coefficient of self-induction.
Concept: Inductance >> Self Inductance
What are eddy currents?
Concept: Eddy Currents or Foucault Currents
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: Different Types of AC Circuits: AC Voltage Applied to a Series LCR Circuit
a) Give two reasons to explain why reflecting telescopes are preferred over refracting type.
Concept: Ray Optics - Mirror Formula
Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
Write Einstein's photoelectric equation and mention which important features in photoelectric effect can be explained with the help of this equation.
The maximum kinetic energy of the photoelectrons gets doubled when the wavelength of light incident on the surface changes from λ1 to λ2. Derive the expressions for the threshold wavelength λ0 and work function for the metal surface.
Concept: Einstein’s Equation - Particle Nature of Light
Answer the following question.
Show that the density of the nucleus is independent of its mass number A.
Concept: Size of the Nucleus
How is a Zener diode fabricated?
Concept: Special Purpose P-n Junction Diodes
Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.
Concept: Zener Diode as a Voltage Regulator
Write the two processes that take place in the formation of a p-n junction.
Concept: p-n Junction
Write the property of a junction diode which makes it suitable for rectification of ac voltages.
Concept: Semiconductor Diode
