1) The frequency of radiation emitted from atom is due to----- a) Depend on frequency of orbital motion of electron b) Depend on change in atomic energy levels c) Both d) Amplitude 2) The energy needed to excite an electron from lower energy state to higher energy state is a) Excitation potential b) Excitation energy c) Both 3) The minimum energy needed to remove an electron from an atom in the ground state is a) Excitation energy b) Binding energy c) Ionisation energy d) Both b and c

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