Experimental Study Of Photoelectric Effect
Chapter Name : Dual Nature Of Radiation And Matter |
Sub Topic Code : 101_12_11_04_04 |
Topic Name : Experimental Study Of Photoelectric Effect |
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Sub Topic Name : Effect Of Frequency Of Incident Radiation On Stopping Potential |
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Introduction
The negative potential of the plate 'C' at which the photo electric current becomes zero is called stopping potential or cut-off potential.
Pre-Requisites:
Stopping potential
Activity:
photocurrent spectroscopy
Real Life Question:
What is Photoccurrent ?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Stopping potential | The stopping potential is the potential (energy/unit charge) or (joules/coulomb) that must be applied to stop the electrons from being ejected from the surface |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Photocurrent | We use photocurrent spectroscopy to study InP nanowire Ohmic devices having Zinc blende. |
Real life uses :
We use photocurrent spectroscopy to study InP nanowire Ohmic devices having Zinc blende.
Places to visit :
Physics Lab
Practical examples around us
| Examples | Explainations |
|---|---|
| photocurrent spectroscopy | We use photocurrent spectroscopy to study InP nanowire Ohmic devices having Zincblende |
What you learn in Theory:
Effect of frequency of incident radiation on stopping potential .
What you learn in Practice:
For a given photosensitive material, there exists a certain minimum cut-off frequency of the incident radiation, called the threshold frequency, below which no emission of photoelectrons takes place, no matter how intense the incident light is.