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Question

Electron emission from a metallic surface by application of light is known as ____.

A
Thermionic emission
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B
Photoelectric emission
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C
High field emission
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D
Autoelectronic emission
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Solution

The correct option is B Photoelectric emission
Electron emission from a metallic surface by the application of light is known as photoelectric emission. When a beam of light strikes a metallic surface, the energy of photons of light is transferred to the free electrons of the metallic surface. This excess energy caused them to jump their orbits.

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