What potential difference should be applied across an X-ray tube to get X-ray of wavelength not less than 0.10 nm? What is the maximum energy of a photon of this X-ray in joule?

Explanation

To solve the problem, we need to find two things:

1. The potential difference (V) that should be applied across an X-ray tube to produce X-rays with a wavelength not less than 0.10 nm.
2. The maximum energy (E_max) of a photon of this X-ray in joules.

### Step 1: Understand the relationship between wavelength and potential difference

The cut-off wavelength (λ_min) is given by the formula:
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