Question

Different experiment perform on photoelectric effect...


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Answer 1

1.HERTZ EXPERIMENT:-

▪Hertz observed that when ultraviolet rays are incident on a negative place of electric discharge tube then conduction take place easily in the tube.

2.HALLWACH EXPERIMENT:-

▪Hallwach observe that if negatively charged Zn plate of electroscope is illuminated by ultraviolet light,its negative charge decreases and becomes neutral and after sometime,it gives positive charge.

▫It indicates that under the action of ultraviolet light some negative charged particles are emitted from the metal.

3.LENARD EXPERIMENT:-

▪Lenard told that when ultraviolet rays are incident on cathode,electrons are ejected,these electron are attracted by anode and due to complete path of photoelectrons photo current flows.

▫When ultraviolet rays are incident on anode,electricity ejected but current does not flow.

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Answer 2

Answer:

Photoelectric effect is the emission of electrons when electromagnetic radiations having sufficient frequency incident on certain metal surfaces. ... As the first experiment which demonstrated the quantum theory of energy levels, photoelectric effect experiment is of great historical importance.

Explanation:

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