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Define the terms threshold frequency and stopping potential in relation to the phenomenon of photoelectric effect. How is the photoelectric current affected on enhancing the
(i) frequency
(ii) intensity of the incident radiations and why?
Q. Define: the temperature coefficient of resistance. The ratio of raise in resistance per degree rise in temperature to its resistance at 0 o C is called as temperature coeff
a) Two long wires, carrying currents i 1 and i 2 , are placed perpendicular to each other in such a way that they just avoid to contact. Determine the magnetic force on a small le
What do you understand by "Absorption coefficient"? which is a better absorber of sound, glass or fibre glass?
Superconductivity The phenomena from which, at sufficiently low temperatures, a conductor can conduct charge along with zero resistance. The current theory for describing supe
There are two major differences between "center of gravity" and "center of mass": 1) The term "center of gravity" aplies to the bodies with mass and weight, while the term "cent
Energy Transformation for a Dart In that case of the dart being launched from the spring gun and the just forces doing work upon the dart are internal forces. Initially, the da
Suppose you blow the top of a bottle and hear a resonance sound (standing wave). The length of the bottle is about 25cm. If the speed of sound in air is about 340 cm/sec., what i
how is the image formed on the retina?
The emf of the driver cell of a potentiometer is 2V & its internal resistance is negligible . The length of the potentiometer wire is 100cm & resistance is 5 ohm.How much resistanc
A copper rod which is 1 centimetre in diameter carries a current of 5 amps. The current is distributed uniformly over the rod. The magnetic field half way among the axis o
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