Ionization potential of hydrogen atom is `13.6 V`. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy `12.1 eV`. The spectral lines emitted by hydrogen atoms according to Bohr's theory will be

Explanation

To solve the problem, we need to determine the spectral lines emitted by hydrogen atoms when they are excited by a photon of energy 12.1 eV. Here’s a step-by-step solution:

### Step 1: Understand the Given Information
- Ionization potential of hydrogen atom = 13.6 eV
- Energy of the incoming photon = 12.1 eV

### Step 2: Calculate the Energy of the Electron in the Excited State
The energy of the electron in the excited state can be calculated by adding the energy of the incoming photon to the ionization potential of the hydrogen atom.
...