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Conserved or not in a collision

Exercise and reference answers

Items
  1. Item
    Total energy
    Category
    Conserved
  2. Item
    Total momentum
    Category
    Conserved
  3. Item
    Photon number
    Category
    Not always
  4. Item
    Photon created
    Category
    Not always
Categories
  1. Item
    Conserved
  2. Item
    Not always
Instructions
Tap each quantity into whether it is conserved.

Explanation

_Source: syllabus Physics Part II, Ch 11 'Dual Nature of Radiation and Matter'_
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