The stopping potential for the photoelectrons emitted from a metal surface of work function 1.7 eV is 10.4 V. Find the wavelength of the radiation used. Also, identify the energy levels in hydrogen atom, which will emit this wavelength.

Explanation

To solve the problem step by step, we will first find the wavelength of the radiation used and then identify the energy levels in the hydrogen atom that correspond to this wavelength.

### Step 1: Understand the relationship between energy, work function, and stopping potential
The energy of the incident photon can be expressed as:
\[ E = \text{Work Function} + \text{Maximum Kinetic Energy} \]

The maximum kinetic energy of the emitted photoelectrons can be expressed in terms of stopping potential \( V_0 \):
\[ \text{Maximum Kinetic Energy} = e \cdot V_0 \]
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