Compton%20Effect%20Heisenberg%20Uncertainty%20Principle

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Compton EffectHeisenberg Uncertainty Principle
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Is momentum Conserved?

• Since a stationary electron can gain some
  velocity and thus momentum in the photoelectric
  effect something needs to lose momentum in order
  for momentum to be conserved.
• Momentum of Light p hf/c h/?

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Compton Effect ? ? h/mc (1 cos ?)

• h/mc 2.43x10-12 m
• What is the max. possible change in wavelength?

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Light of wavelength 6nm hits an electron and is
scattered by 60o. What is the new wavelength of
the light?
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Heisenberg Uncertainty Principle

• There is a fundamental uncertainty in the
  measurement of momentum and position or energy
  and time interval.
• ?p ?y gt h/4p
• ?E ?t gt h/4p

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If you can measure the position of a brick (m
1kg) within ?x .1 nm what is the corresponding
uncertainty in the speed of the brick?
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Within the atom the electron is confined to a
space of about 1.0x10-10m. What is the
uncertainty in its momentum?