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SS3: PHYSICS - 2ND TERM

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  1. Magnetic Field | Week 1
    4 Topics
  2. Electromagnetic Field
    4 Topics
  3. Electromagnetic Induction
    6 Topics
  4. The Transformer
    5 Topics
  5. Simple A.C Circuit
    4 Topics
  6. Models of the Atom
    2 Topics
  7. Radioactivity
    3 Topics
  8. Half Life
    8 Topics
  9. Energy Quantization
    3 Topics
  10. Photoelectric Effect
    4 Topics
  11. Wave Particle Paradox
    3 Topics



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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

f- frequency of radiation

λ = wavelength of radiation

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