Light is incident on the cathode of a photocell and the stopping voltages are measured from light of two difference wavelengths. From the data given below, determine the work function of the metal of the cathode in eV and the value of the universal constant hc/e.
Wavelength `(Å)` Stopping voltage (volt)
4000 1.3
4500 0.9

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the Photoelectric Effect
The photoelectric effect states that when light of a certain frequency (or wavelength) hits a metal surface, it can eject electrons from that surface. The energy of the incoming photons is given by the equation:
\[ E = \frac{hc}{\lambda} \]
where:
- \( E \) is the energy of the photon,
- \( h \) is Planck's constant,
...