write down Einstein photoelectric equation and explain the concept of threshold frequency?
Answers
Explanation:
Einstein’s Photoelectric Equation
The Photoelectric Effect
Let us recall the Photoelectric effect.
Firstly, above a specific value of the frequency (threshold frequency), the strength of the photoelectric current depends on the intensity of the light radiation.
The reverse potential at which the photo-current stops (stopping potential) is independent of the intensity of light. Therefore, no matter how intense your source of light is, it can’t defeat the stopping voltage.
Any values of frequency below the threshold value are unable to produce a photoelectric current. Therefore, even if you take a metallic strip to the surface of your nearest star (Sun), you will never get a photocurrent if the frequency of the radiation is smaller than the threshold frequency.
The photoelectric effect was almost instantaneous. This meant that as soon as you turn your source of light on, pop goes the electron!
Quantum of Radiation