Light of wavelength 180 nm ejects photoelectrons from a plate of metal whose work - function is 2 eV. If a uniform magnetic field of `5xx10^(-5)` T be applied parallel to the plate, what would be the radius of the path followed by electrons ejected normally from the plate with maximum energy.

Explanation

To solve the problem step-by-step, we will follow the principles of the photoelectric effect and the motion of charged particles in a magnetic field.

### Step 1: Calculate the Energy of the Incident Photon
We start by calculating the energy of the photon using the formula:
\[ E = \frac{hc}{\lambda} \]
Where:
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