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Which one of the following pairs is not correctly matched:
(1) Rutherford-Proton
(2) J.J. Thomsom-Electron
(3) J.H. Chadwick-Neutron
(4) Bohr-Isotope
Ans:(4)Bohr-Isotope
A certain machine exerts a force of 200 Newton on a box whose masses 30 kilograms. The machine moves the box a distance of 20 meters with a horizontal floor. What amount o
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definition and explanation
A spring is held vertically downward and a current is passed through it . Then the length of the spring : A . increases B. decreases C . does not change D the spring osc
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operation symmetry
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