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When hydrogen atom is excited, it returns to its normal unexcited (or ground state) state by emitting the energy it had absorbed previous. This energy is given out by the atom in t
wrench from the top of an 80 m high tower what is the velocity of the wrench when it strikes the ground?
Q. Explain what is light? Light is certainly electromagnetic radiation but the expression electromagnetic radiation is by no means an explanation of what light is. Light is a w
A pure semiconductor under ordinary conditions behaves like (A) A conductor. (B) An insulator. (C) A magnetic material. (D) A ferro-electric material. A
Explain Motion in 2 Dimensions When motion occurs in two dimensions, position, displacement and distance, speed, velocity and acceleration can be described using the x-y plane.
A house is air conditioned using solar energy. Solar radiation heats a pressurized tank such that the temperature is maintained at 175 o C. 1500 kJ must be extracted from the hous
(B) COVALENT BOND: What about reactions between two non metals? Many non metals do bond together. Hydrogen atoms, for instance, frequently react with other hydrogen
what the main defination of current? Electrical current is a measure of the amount of electrical charge transferred per unit time. It represents the flow of electrons through a
Loudness: It is the characteristics of sound by a faint sound can be distinguish by a loud sound is known as loudness.
Q. What are polar molecules? Give an example. i) A polar molecule is one in that the centre of gravity of the positive charges is separated from the centre of gravity of the ne
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