A photon of wavelength 400nm strikes a metal surface. The electrons are ejected with a velocity `5.85 xx 10^(5)ms^(-1)`. Calculate the minimum energy required to remove an electron from the metal surface. The mass of an electron is `9.109 xx 10^(-31)kg`.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the Photoelectric Effect
The photoelectric effect can be described by Einstein's photoelectric equation:
\[ E = \Phi + \frac{1}{2} mv^2 \]
Where:
- \( E \) is the energy of the incoming photon.
- \( \Phi \) is the work function (minimum energy required to remove an electron).
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