Describe an experiment to verify Einstein’s equation for the photoelectric effect and explain how Plank’s constant may be obtained from the experiment.

Describe an experiment to verify Einstein’s equation for the photoelectric effect and explain how Plank’s constant may be obtained from the experiment.

• A radiation of known frequency, f, is made incident on the photocathode
• Emitted electrons travel to the anode and cause a current to flow, detected at E.
• The p.d V is adjusted until the reading of E is zero (i.e. no current flows).
• The value of this p.d is the stopping potential (Vs) and is recorded from the voltmeter V.
• The procedure is repeated with light of different frequencies, f.
• A graph of stopping potential (Vs) against frequency (f) is plotted

Please Subscribe to promote this website. Subscription is free

Share with a friend

Your comment is valuable

Thank you so much