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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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SS3: PHYSICS – 2ND TERM Half Life Questions & Solutions
Lesson 8, Topic 8
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Questions & Solutions

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What is the energy released when the particles of uranium -237 are separated 

Mass of uranium -237.0440u, mass of proton = 1.0073u

Mass of neutron = 1.0087u, 1u= 931Mev, 1ev = 1.6 x 10o19J

Solution 

Mass defect, ∆m = mass of proton + mass of neutron – mass of uranium 

= (92 x 1.0073 + 145 x 1.0087) – 237.0440

= (92.6716 + 146.2615) – 237.0440

= 238.9331 – 2370440

= 1.8891u

IU = 931mev

= 1.8891 x 931

    = 1758.7521mev

Iev = 1758.7521 x 1.6 x 10-19 x 106

= 2.814 x 10-10J

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