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Exercise 1 |
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Example-6 |
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Example-7 |
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Exercise 2
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Photoelectric Effect |
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When light falls on certain metals, electrons are ejected from the surface of the metal. In the arrangement shown in the figure, the wire marked anode is held at positive potential with respect to the curved plate marked cathode |
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When light of certain minimum frequency falls on the cathode, electrons are emitted in all directions. These electrons are called photoelectrons . Some of these electrons reach the anode wire which provides a path to the electrons to give rise to a mesurable photo-current . By making the anode more positive with respect to the cathode, more electrons are attracted towards the anode and the photo-current increases. When the anode potential is such that all the emitted electrons reach the anode, any further increase in the anode voltage does not increase current any further. |
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