1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively.
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
For a radioactive material, half-life is 10
minutes. If initially there are 600 number of
nuclei, the time taken (in minutes) for the
disintegration of 450 nuclei is
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The ratio of kinetic energy to the total energy
of an electron in a Bohr orbit of the hydrogen
atom, is
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Radioactive material 'A' has decay constant '8 $$\lambda $$' and material 'B' has decay constant '$$\lambda $$'. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be e ?
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