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Q. Define roentgen and activity and Curie?
One roentgen (1R) is described as the quantity of radiation which produces 1.6 × 1012 pairs of ions in 1 gram of air.
The activity of a radioactive substance is described as the rate at which the atoms decay. Curie is described as the quantity of a radioactive substance which gives 3.7 × 1010 disintegrations per second or 3.7 × 1010 Becquerel.
Newton 2nd law of motion proof
who present first three laws of motions
Define Frozen Solid (Moscow Phys-Tech)? Evaluation how long it will take for a small pond of average depth D=0.5 m to freeze entirely in a very cold winter, when the
assignment about electro magnetic waves
An alpa particle is directed vertically upward with a speed of 3 X 104 Km/Sec in a region where a magnetic field of magnitude 1 Tesla exists in the direction south to north. Determ
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How many types fitting are there? Literally thousands for all thought or dreamed up application. By small bullet lenses uses very large floor, pool and pavers lights. From simp
What is Atomic Models? The concept of atoms was first suggested by the ancient Greeks. The atom was supposed to be the smallest piece of matter. Then J. J. Thompson discovered th
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The internal energy change when a system goes from state A to B is 40 kJ/mole. If the system goes from A to B by a reversible path and returns to state A by an irreversible path wh
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