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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 10, Topic 4
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Questions & Solutions

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Example

Calculate the frequency of the photons whose energy is required to eject surface electron with a k.e of 3.8 x 10-17eV and the work function of the metal is 2.66 x 10-17eV.

E = hf – hf0

Hf = E + hf0

f = \( \frac{E + hf_0}{H} \)

f = \( \frac{3.80 \times 10^{-17} + 2.66 \times 10 {-17}}{6.6 \times 10 {-34}} \)

f = \( \frac{6.46 \times 10^{-17} + 1.6 \times 10 {-19}}{6.6 \times 10 {-34}} \)

= 2.42 x 1014Hz

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