Atoms and Nuclei — MCQ Practice

The half-life of a radioactive isotope is 2 hours. If a sample initially contains $10^{10}$ radioactive nuclei, how many nuclei will remain undecayed after 6 hours?

According to Bohr's model, the radius of the $n^{th}$ orbit of a hydrogen atom is proportional to:

Which of the following statements is INCORRECT regarding the strong nuclear force?

A radioactive nucleus undergoes a series of decays: $alpha, \beta^-, alpha, gamma$. What are the changes in the atomic number (Z) and mass number (A) of the final nucleus compared to the original nucleus?

The energy of an electron in the $n^{th}$ orbit of a hydrogen atom is given by $E_n = -13.6/n^2,\text{eV}$. What is the energy required to excite an electron from the ground state to the first excited state?

If the binding energy per nucleon for a nucleus is $8.0,\text{MeV}$ and its mass number is 20, what is the total binding energy of the nucleus?