MCQ
Number of spectral lines in hydrogen atom is
- A$3$
- B$6$
- C$15$
- ✓Infinite
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Statement $I:$ The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample.
Statement $II:$ The half life of a radionuclide is the sum of the life time of all nuclei, divided by the initial concentration of the nuclei at time $t =0$.
In the light of the above statements, choose the most appropriate answer from the options given below :

The angle of projection can be given by