Describe an experiment to demonstrate photo electric effect.

Describe an experiment to demonstrate photo electric effect.

• Freshly cleaned zinc plate is placed on top of a negatively charged electroscope.
• Ultraviolet radiation is directed onto the zinc plate
• The leaf gradually falls indicating the electroscope has lost charge which are electrons.

Note that when the leaf is positively charged there will be no observed effect because the positive charge will attract the emitted electron

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