In the photoelectric effect, light falls on a metal surface,  and electrons are emitted. It studies the relation between light intensity and frequency and the electron current. This program simulates photoelectric effect and it can compute Planck's constant.

Instructions:

• On turn on source light.
• Vertical Scrollbar changes light frequency.
• With Right Horizontal Scrollbar  To select light intensity.
• Left Horizontal Scrollbar varies the retarded voltage (to stop electron current).
• You can choose, a Metalfrom this list.
• Off turns the light off.
• Plot shows a frame to write four experimental values and then Planck's constant in computed. Fill the blanks, press the frame plot button and h value appears.