If the electron of a hydrogen atom is in the third orbit,it represents its ...... excited state.

What is the difference between a photon and a quantum?

How does the energy gap between successive energy levels in an atom vary from low to high $n$ values?

Based on the equation $E = -2.178 \times 10^{-18} \ J \left( \frac{Z^2}{n^2} \right)$,certain conclusions are written. Which of them is not correct?

How does the energy of an orbit change as we move away from the nucleus in a hydrogen-like atom?

$A$ bulb emits light of wavelength $4500 \ \mathring{A}$. The bulb is rated at $150 \ \text{W}$ and $8\%$ of the energy is emitted as light. How many photons are emitted by the bulb per second?