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Two cells of emf 4 V and 2 V having a respective internal resistance of 1 Ω and 2 Ω are connected in parallel, so as to send current in the same direction through an external resistance of 5 Ω. Find the current through the external resistance.
Concept: Kirchhoff’s Laws of Electrical Network
To convert a moving coil galvanometer into an ammeter we need to connect a ______.
Concept: Moving Coil Galvanometer
Draw a neat labelled diagram for the construction of 'cyclotron'
Concept: Cyclotron
If the polarising angle for a given medium is 60°, then the refractive index of the medium is.................
Concept: Polarisation
Determine the change in wavelength of light during its passage from air to glass. If the refractive index of glass with respect to air is 1.5 and the frequency of light is 3.5 x 1014 Hz, find the wave number of light in glass.
[Velocity of light in air c = 3 x 108 m/s]
Concept: Reflection and Refraction of Plane Wave at a Plane Surface Using Wave Fronts
With the help of neat diagram, explain how non-polar dielectric material is polarised in external electric field of increasing intensity. Define polarisation in dielectrics.
Concept: Polarisation
Wavelengths of two notes in the air are`[70/153]^m` and `[70/157]^m`. Each of these notes produces 8 beats per second with a tuning fork of fixed frequency. Find the velocity of sound in the air and frequency of the tuning fork.
Concept: Beats
Draw a neat labelled diagram showing the plane of vibration and plane of polarisation for polarised light.
Concept: Polarisation
In a cyclotron, magnetic field of 3·5Wb/m2 is used to accelerate protons. What should be the time interval in which the electric field between the Dees be reversed?
(Mass of proton = 1· 67 x 10-27Kg, Charge on proton =1·6x10-19c).
Concept: Cyclotron
On the basis of Huygens' wave theory of light prove that velocity of light in a rarer medium is greater than velocity of light in a denser medium.
Concept: Huygens' Principle
For a glass plate as a polariser with refractive index 1.633, calculate the angle of incidence at which light is polarised.
Concept: Polarisation
If the critical angle of a medium is sin-1(3/5), find the polarising angle.
Concept: Polarisation
In Doppler effect of light, the term “red shift” is used for ______.
(A) frequency increase
(B) frequency decrease
(C) wavelength decrease
(D) frequency and wavelength increase
Concept: Beats
If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water ______.
Concept: Cyclotron
Doppler effect is not applicable when _______.
(A) source and observer are at rest.
(B) there is a relative motion between source and observer.
(C) both are moving in opposite directions.
(D) both are moving in same direction with different velocities
Concept: Beats
Explain the construction of plane wavefront using Huygens’ principle.
Concept: Huygens' Principle
The refractive indices of glass and water w.r.t. air are 3/2 and 4/3 respectively. Determine the refractive index of glass w.r.t. water.
Concept: Polarisation
The working of RADAR is based on ...............
a) resonance
b) speed of a star
c) Doppler effect
d) speed of rotation of sun
Concept: Beats
Determine the change in wavelenght of light during its passage from air to glass, if the refracrtive index of glass with respect to air is 1.5 and the frequency of light is 5 x 1014 Hz. Find the wave number of light in glass (velocity of light in air c = 3 X 108 m/s)
Concept: Wave Theory of Light
