Q.No.126: - What
are the causes of luminescence? Describe them briefly.
Ans: -
Luminescence can have a variety of causes some of them are given below.
i)
Chemiluminescence:-
When the energy
that excites the atoms originates from a chemical reaction is called
Chemiluminescence .
ii)
Bioluminescence:- Often the effect occurs in living things,
such as in fireflies and many marine organisms, in this case it is called
bioluminescence.
iii)
Triboluminescence:-
Light can also be
emitted when certain crystals for example, sugar are crushed the effect called
Triboluminescence.
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