The electromagnetic waves produced when fast moving electrons are suddenly stopped by metal target of high atomic number are
X – Rays are produced when fast moving electrons are suddenly stopped by metal target of high atomic number.
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On heating a conductor its resistance
On heating the conductor, its resistance increases. This happens due to increase in the number of collisions between free charges... View Article
Alloys like manganin and constantan are used for making standard resistance coils as they have________
Answer: Alloys like manganin and constantan are used for making standard resistance coils as they have nearly independent of temperature.... View Article
Choose the right answer from the following
The resistance in ohms in the four arms of a Wheatstone bridge are as follows. In which combination of the... View Article
Electromagnetic waves constitute of
Electric and magnetic field varying in space and time sinusoidally and propagating through space such that the two fields are... View Article
Which colour of the visible spectrum has the greatest wavelength?
Red has the greatest wavelength in the visible spectrum.
In electromagnetic waves the ratio of amplitudes of electric field and magnetic field is equal to
In electromagnetic waves, the ratio of amplitudes of the electric field and the magnetic field is equal to the velocity... View Article
If the resistivity of an alloy is P1 and that of metal is P, then
Resistivity of alloys is generally more than metals.
When the incident light itself is polarized with electric field vector in the plane of incidence, then if the angle of incidence is θp, there is no
The component of light beam that vibrates perpendicular to the reflecting surface is reflected less as compared to the component... View Article
A ray of light strikes a glass plate at an angle of 600. If the reflected and refracted rays are perpendicular to each other, then refractive index of glass is
Brewster’s law is defined as the light which receives maximum polarization from a reflecting surface when it is incident to... View Article
A ray of light is incident on the surface of glass plate at an angle of incidence equal to Brewster’s angle Ø. If μ represents the refractive index of glass with respect to air, then the angle between the reflected and refracted rays is:
When the light is incident at Brewster’s angle, the angle between the reflected ray and refracted ray is 90o, irrespective... View Article
Eddy currents have negative effects. Because they produce
Eddy currents have negative effect, as they produce heating and damping.
N resistors each of resistance R are first combined to get minimum possible resistance and then combined to get maximum possible resistance. The ratio of the minimum to maximum resistance is
the maximum resistance is NR and the minimum resistance is R/N, so their ratio is 1/N2
Kirchhoff’s first law is based on ?
Kirchhoff’s first law states that the sum of the currents meeting at a junction in a closed circuit is zero.... View Article
When a forward bias is applied to a p-n junction, it
In forward biasing the positive terminal of the battery is connected to the the p-side and the negative terminal to... View Article
If the internal resistance of a cell is infinite, the current in the circuit will be
Infinite resistance means no current can flow through it.
What is the maximum current that can be drawn from a cell of emf E and internal resistance r connected to an external resistance R?
as the maximum current that can be drawn from a cell is for R =0 and it is I =... View Article
Electromagnetic Spectrum is
Electromagnetic Spectrum is orderly distribution of electromagnetic radiations according to their wavelength or frequency.
When Wheatstone bridge is in balance condition, the current through galvanometer will be
When the bridge is in balance condition, no current will flow through the galvanometer because potential difference between the two... View Article
What is the origin or source of Visible light
visible light is produced due to atomic excitation.
