1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
An electron in hydrogen atom makes a transition n1 $$ \to $$ n2 where n1 and n2 are principal quantum numbers of the two states . Assuming Bohr's model to be valid, the time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u = 931 MeV)
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half life of a radioactive isotope 'X' is 20 years. It decays to another element 'Y' which is stable. The two elements 'X' and 'Y' were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be
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