Question : How many hydrogen atoms are there in a molecule of methane?

Question : If the sum of $\frac{a}{b}$ and its reciprocal is 1 and $a\neq 0,b\neq 0$, then the value of $a^{3}+b^{3}$ is:

Question : In which region of the electromagnetic spectrum does the Lyman series of hydrogen atoms lie?

Question : What is the value of $\frac{(a^2+b^2)(a-b)-(a^3-b^3)}{a^2b-ab^2}?$

Question : Rutherford's  scattering experiment proved the presence of