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Lesson 11, Topic 1
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# Wave Nature of Light

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A scientist called De Broglie proposed that matter can behave as wave as well as particles. He suggested that a particle of mass, m, moving with a velocity, v, would possess a wavelength λ, of

λ= $$\frac {h}{mv} = \frac{h}{p}$$

h – Plank’s constant

p – momentum p = mv

This wavelength is called De Broglie wavelength.

Plank’s Theory

This reveals that radiations are emitted in discrete packs or packets of energy known as quanta.

E = hf

λ= $$\frac{hc}{\lambda}$$

c – Speed of light

h – Plank’s constant