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Electrons are emitted from a photosensitive surface when it is illuminated by green light but electron emission does not take place by yellow light. Will the electrons be emitted when the surface is illuminated by (i) red light, and (ii) blue light.
Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density. Ans: Plastics are Bad
How can light be defined in simplest form? The common explanation of 'light' (visible) is electromagnetic radiation visible to the human eye. It is only a little part of wha
A quantum particle confined to one dimensional box of width 'a' is in its first exited state. What is the probability of finding the particle over an interval of (a/2) marked symme
A metal ring stand and rings A useful ring stand and rings can be made from a flat curtain rod and the fixtures which clamp over electric bulbs to hold lamp shades. These are u
Electric field lines In good metallic conductors: In good metallic conductors: (i) Static electric fields are not there (zero inside a conductor) (ii) Charges reside
The town of Smog, Idaho is located in a river valley and has a footprint of 6 km x 2 km. It has an average daily emission rate of 1000 kg/day of PM 2.5 into the atmosphere from
Right-hand rule: A trick for right-handed coordinate systems to find out which way the cross product of two 3-vectors will be directed. There are few forms of this rule, and t
Two kilograms of an ideal gas with constant c p =1kJ/kgK and c v = 0.7kJ/kgK are contained in an insulated piston-cylinder device with an initial volume of 0.3m 3 and a pressure o
Internal Resistance of Circuit: As mentioned earlier in the section on batteries, every source of electricity, such as a cell or generator has resistance to current flow called
A bar magnet is overhanging north end up well above a vertical coil of wire. The bar magnet is released and as it falls down toward the coil it falls along a path that will take it
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