An orbiting satellite can become charged by the photo- electric effect when sunlight ejects electrons from its outer surface. Satellites must be designed to minimize such charging because it can ruin the sensitive microelectronics. Suppose a satellite is coated with platinum, a metal with a very large work function `(Phi= 5.32 eV)`. Find the longest wavelength of incident sunlight that can eject an electron from the platinum.

Explanation

To find the longest wavelength of incident sunlight that can eject an electron from platinum due to the photoelectric effect, we can follow these steps:

### Step 1: Understand the Photoelectric Effect
The photoelectric effect states that when light of sufficient energy strikes a material, it can eject electrons from that material. The energy of the incoming photons must be greater than or equal to the work function (Φ) of the material.

### Step 2: Use the Photoelectric Equation
According to Einstein's photoelectric equation, the energy of a photon (E) is related to its wavelength (λ) by the formula:
\[ E = \frac{hc}{\lambda} \]
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