ENTRANCE TEST 2008

Q: Beta ray emitted by a radioactive substance is

(a) :  An electron which was existing outside the nucleus
(b) :  An electron which was existing inside the nucleus
(c) :  An electron emitted by the nucleus as a result of the decay of neutron inside the nucleus
(d) :  A pulse of electromagnetic wave
Answer:  An electron which was existing inside the nucleus
Explanation:  

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