1
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The half-life of tritium is 12.5 years. What mass of tritium of initial mass 64 mg will remain undecayed after 50 years?
A
32 mg
B
8 mg
C
16 mg
D
4 mg
2
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The total energy of an electron revolving in the second orbit of hydrogen atom is
A
-13.6 eV
B
-1.51 eV
C
-3.4 eV
D
zero
3
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The period of revolution of an electron in the ground state of hydrogen atom is $T$. The period of revolution of the electron in the first excited state is
A
$2 T$
B
$4 T$
C
$6 T$
D
$8 T$
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