Practicing Success
In a typical set-up of photo electric effect, the original source of blue light is replaced with a source of red light of testy. Which of the following phenomenon is observed? |
Photoelectric current increases Photoelectric current decreases Stopping potential increases Stopping potential decreases |
Stopping potential decreases |
The correct answer is option (4) : Stopping potential decreases Frequency of red light is less than frequency of blue light therefore kinetic energy of emitted electron decreases and stopping potential decreases. |