1
IIT-JEE 1993
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The light radiations with discrete quantities of energy are called ______.
2
IIT-JEE 1988
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The uncertainty principle and the concept of wave nature of matter were proposed by ______ and ______ respectively. (Heisenberg Schrodinger, Maxwell, de Broglie)
3
IIT-JEE 1983
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Elements of the same mass number but of different atomic numbers are known as ____.
4
IIT-JEE 1982
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Isotopes of an element differ in the number of ______ in their nuclei.
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