In ultraviolet light of wavelength 200 nm is used in an experiment of photoelectric effect with lithium cathode (w = 2.5 eV). Then calculate
(i) `K. E _(max)`
(ii) Stoppiong potential

Explanation

To solve the problem, we will follow these steps:

### Given Data:
- Wavelength of ultraviolet light, \( \lambda = 200 \, \text{nm} = 200 \times 10^{-9} \, \text{m} \)
- Work function of lithium, \( W = 2.5 \, \text{eV} \)

### Step 1: Calculate the Energy of the Incident Photons
The energy of the incident photons can be calculated using the formula:
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