physics G485 OCR - long style question answers

I got the resources from another source but shortened it into managable chunks

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  • Created by: Jessica
  • Created on: 11-06-13 16:38
A mass spectrometer is used to...
Identify particles once they have been ionised
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What is controlled in order to measure mass
Movement in electric and magnetic feilds
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The sample is first...
Vapourised and ionised
3 of 15
Then a fine beam of...
positively charged ions are sent into a velocity slector
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It has a magnetic flux density meaning...
only particles with a certain velocity will be able to get through the small slit
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The beam enters...
A second magnetic field and is deflected. - the radius of deflection can be used to measure mass
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equation used to measure the mass - from a mass spectrometer
m= BQr / v - the horizontal velocity stays the same
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Uses of capacitors
*Flash photography *Back-up power supply on a computer *Nuclear fusion
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Production of X-rays - electrons are
Removed from filament by heating
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Work is done on electrons by
accelerating it through an electric field (PD)
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the electrons are directed towards
A metal target (Mo) causing the electrons to be excited to higher energy levels
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When the (Mo) electrons de-ecxite
x-ray photons are produced
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Photo electric effect
low energy x-rays (
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Pair Production
x-ray photons (>1.2MeV) passes thorugh the electric field of thenucleus and produces an electron-positron pair. The positron is anihilated by another electron
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Compton Scattering (/effect)
x-rays photon (.5-5MeV) knocks an electron out of an atom, the interaction between the photon and electron is inelastic meaning the scattering photon has less energy than before so a greater wavelength.
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Other cards in this set

Card 2

Front

What is controlled in order to measure mass

Back

Movement in electric and magnetic feilds

Card 3

Front

The sample is first...

Back

Preview of the front of card 3

Card 4

Front

Then a fine beam of...

Back

Preview of the front of card 4

Card 5

Front

It has a magnetic flux density meaning...

Back

Preview of the front of card 5
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