Calculate the velocity of electron ejected from a platium surface when radiation of `200 `nm falls on it .The work function of platinum is `5 eV(1 eV = 1.6 xx 10^(-19) J)`

Explanation

To calculate the velocity of an electron ejected from a platinum surface when radiation of 200 nm falls on it, we can follow these steps:

### Step 1: Convert the wavelength from nanometers to meters
The wavelength (λ) is given as 200 nm. To convert this to meters:
\[ \lambda = 200 \, \text{nm} = 200 \times 10^{-9} \, \text{m} \]

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