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If the light is completely polarized by reflection, then angle between the reflected and refracted light is

There is one particular angle of incidence, called polarizing angle (θp) or Brewster’s angle at which polarization of the reflected ray is... View Article

The intensity of light transmitted by the analyzer is maximum when

According to Malus’s law Iαcos2θ, when θ=0o or 180o, I=Iocos20o = Io i.e the intensity of the light transmitted by the analyzer is maximum when... View Article

For semiconductors, the major factor affecting the value of resistivity when temperature changes is

n increases with temperature and this increase more than compensates any decrease in relaxation time. Hence, for semiconductors resistivity... View Article

Which type of materials shows the given below graph given below.

Resistivity of semiconductors decreases with increase in temperature. So, this graph must be of a semiconductor material.... View Article

A steady current flows in a metallic conductor of the non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are (1) current, electric field and drift speed (2) drift speed only (3) current and drift speed (4) current only

Answer: (4) current only When a steady current flows in a metallic conductor of non-uniform cross-section, the current flowing through... View Article

The type of materials whose resistivity is affected on adding the impurity is known as

The resistivity of semiconductors decreases on adding the impurity.... View Article

The change in diffraction pattern of a single slit, when the monochromatic source of light is replaced by a source of white light will be

When a source of white light is used instead of a monochromatic source, the diffracted image of the slit gets dispersed into constituent colours... View Article

When viewed in white light, a soap bubble shows colours because of

Due to interference, when soap bubble is viewed in white light it shows colours.... View Article

If the Young’s apparatus is immersed in water, the effect on fringe width will________

Answer: If the Young's apparatus is immersed in water, the effect on fringe width will be narrower. The wavelength of light is less in water... View Article

In an interference experiment monochromatic light is replaced by white light, we will see:

Answer: The definition of interference phenomena in which two or more waves superpose to form a resultant wave of greater, lower or the same... View Article

Two coherent sources produce a dark fringe when phase difference between the interfering waves is(n integer)

Dark fringes will be produced when there are destructive interference. The condition for that is the two waves should have a phase difference... View Article

Current provided by a battery is maximum when

Current provided by a battery is maximum when internal resistance is equal to external resistance.... View Article

Young’s Experiment establishes the

The pattern Young actually observed consisted of alternate dark and bright fringes. If light consist of particles then these bundles should... View Article

The current in a coil of resistance 90 ohms is to be reduced by 90 percent. What value of resistance should be connected in parallel with it?

The resistance is connected in parallel. Hence, voltage across the required resistance S and 90Ω is the same, i.e. 0.9 I × S = 0.1 I × 90 S = 90/9= 10Ω... View Article

When the interference occurs with non-coherent sources, _ of the superimposing waves add like _.

When the interference occurs with non-coherent sources, intensities of the superimposing waves add like scalars, I = I1 + I2... View Article

For sustained interference we need two sources which emit waves:

For sustained interference we need two sources which emit waves of constant phase difference.... View Article

In the given picture the Ring A at the bottom is positively charged. Another Ring B is brought and placed over it. Ring B hovers at a certain height above A. What could be the charge on Ring B.

There is a repulsion between the two rings and we know that like charges repel each other. Since Ring B is getting repelled by A as it is... View Article

The potential difference across a cell of emf E and internal resistance r is

V = E - Ir... View Article

Coherent sources can be created by the division of:

Coherent sources can be created by the division of both amplitude and wave front.... View Article

The light waves from two independent monochromatic light sources are given by: y1 =2 sinωt and y2 =3 cos ωt,then the correct statement is:

Two independent light sources cannot be coherent because they cannot generate waves having a constant phase difference.... View Article

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