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Light as Wave

Electrons are...

Question

Electrons are emitted from metal surface when light falls on it . Is this statement true or false ?

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Solution

Yes. It's called photo electric effect
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Q. Electrons are ejected from the metal when a light of certain frequency strikes the surface of a metal, This phenomenon is known as photoelectric effect and the ejected electrons are called photoelectrons.
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Q. The work function of a metallic surface is 5.01 eV. The photo-electrons are emitted when light of wavelength 2000Å falls on it. The potential difference applied to stop the fastest photo-electrons is
[MP PET 1991; DPMT 1999]

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[h = 4.14 \times 10^{- 15} e V s e c]

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