Question

dual nature of metal and light​

Answer 1

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$\sf\small\underline\red{dual \: nature \: of \: metal:-}$

The minimum energy that is required to emit an electron from the surface of a metal can be supplied to the free electrons by either of the methods given below: Thermionic Emission: Required thermal energy is provided to the free electrons by suitably heating it so as to enable them to come out of the metal.

$\sf\small\underline\red{dual \: nature \: of \: light:-}$

Light has a dual nature.

• Sometimes it behaves like a particle (called a photon), which explains how light travels in straight lines.
• Sometimes it behaves like a wave, which explains how light bends (or diffracts) around an object.