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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Atoms Molecules and Nuclei Glossary

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                     Photon: A quantum of energy hu where h is called Planck's constant and u is the frequency of the radiation.

                     Quantum: A "packet" of energy.

                     Principal Quantum Number: An integral number which designates a particular quantised orbit.

                     Binding Energy (of an Electron): The minimum energy that must be given to an electron to remove it from its orbit and take it to infinity.

                     Lyman Series: The spectral series of the hydrogen spectrum which lies in the ultraviolet region.

                     Balmer Series: The spectral series of the hydrogen atom which lies in the visible region.

                     Paschen Series/ Brackett Series/ Pfund Series: Spectral series of the hydrogen atom which occur in the infra red region.

                     Ground State: The lowest energy state.

                     Ionisation Potential Energy: The energy required to remove the electron from its ground state to infinity.

                     Atomic Number (Z): The number representing the number of protons (or electrons) in an element.

                     Mass Number (A): The number representing the number of nucleons (neutrons and protons) in an element.

                     Isotopes: Elements having the same atomic number but different mass numbers.

                     Radioactivity: The nuclear phenomenon in which extremely penetrating radiations are spontaneously emitted by elements of mass numbers greater than 206.

                     Alpha (a) Particles: They are helium nuclei (2He4).

                     b-particles: Electrons emitted by the nucleus during radioactive decay.

                     g rays: Extremely penetrating electromagnetic radiations emitted by the nucleus during radioactive disintegration.

                     Decay Constant (l): It is the ratio of the rate at which the number of radioactive atoms disintegrate to the number of atoms present at that instant.

                     Half-Life: The time required for a given number of radioactive atoms to reduce to half of their initial value.

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