🚀Setting the Stage: Think about a party where certain songs make people dance while others don't. That's the kind of magic certain light wavelengths have over electrons!

• Millikan's device had two metal plates in a vacuum.
• The cathode (like a dance floor for electrons): Gets hit by light of various colors.
• The anode: Can be made positive or negative. Think of it as the dance's entrance - electrons want to get to it!
• The fun part: If the light (song) is just right, electrons will "dance" their way to the anode. This dance creates electric current.

🌟 Real-world Example: It's like the entrance to a club; the better the song (light frequency), the more people (electrons) enter!

• When the light's frequency exceeds a threshold, electrons move with maximum energy.
• When the anode becomes negative, at some point, even the most energetic dancers (electrons) can't make it. At this moment, the entrance fee (potential difference) is called the stopping potential.

• The photoelectric equation is given by

             eVs = hf − hf₀​

            Convert it using wavelengths

              Vs = \(\frac {hc}{eλ} - \frac {hc}{eλ_o}\)

           Plotting Vs against \(\frac {1}{ λ}\)​ gives a straight line. Cool, right?

🎈 Fun Fact: The slope of this line is only based on constants (h, c, and e) and NOT the metal used.