7B.2 Particle detectors Flashcards

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1
Q

how are particles detected in electron diffraction and Geiger and Marsden’s alpha scattering experiment

A

by the light that is observed when the particles hit the fluorescent screen

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2
Q

how does the GM work

A

the particle to be detected enters the tube and ionizes a gas (usually argon) that filled in the tube producing ions and electrons, then the ins and the electrons becomes accelerated by the electric field between electrodes in the tube and then they get discharged when the reach the electrodes, that forms a pulse of electricity that is counted by GM counter

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3
Q

how do most particle detectors work

A

through ionization

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4
Q

what is the bubble chamber

A

it is a particle detection system where the particles cause bubbles to form in a superheated liquid, usually hydrogen

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5
Q

the trail of bubbles in the bubble chamber shows

A

the path of the particles moving

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6
Q

what can we tell from the bubble chamber

A
  1. the path of the particles moving
  2. the curved paths of the particles being affected by the magnetic field, the direction they curve in and the radius of the curvature tells us there charge and mass
  3. particle interactions, where some tracks end or change quickly, and some tracks appear out of nowhere, usually started from uncharged particles colliding to form charged ones
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7
Q

when particles spiral when they interact with other particles what happens to there kinetic energy and why do they spiral inward

A

their kinetic energy is being lost by ionizing particles in its path , s since the radius if the curvature is proportional to the speed r = mv/Bq deceleration of it will cause it to spiral inward

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