physics G485 OCR - long style question answers - Flashcards in A Level and IB Physics

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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

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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

Card 4

Front

Then a fine beam of...

Back

Card 5

Front

It has a magnetic flux density meaning...

Back

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physics G485 OCR - long style question answers