Flashcards
Particle detectors & particle accelarators
Cards in this deck (19)
- 1What is a particle detector?A device used to observe particle collisions.
The properties of the particles created are identified during a collision.
Hence, we can identify what particles are created. - 2What are the four particle detectors?Bubble chamber
GM tube
Cloud chamber
Drift chamber - 3How does a bubble chamber work?•It contains super heated liquid hydrogen.
•The liquid hydrogen will be ionised by charged particles which are sent through the chamber.
•The ionisation causes the ion to form trails. - 4How do we achieve super heated liquid hydrogen?•Liquid hydrogen is kept just below its boiling point.
•Pressure is reduced.
•The pressure reduction causes the boiling point of the liquid to be lowered than the current temperature of the liquid. - 5Why is it called as a bubble chamber?•When liquid hydrogen is ionised, small bubbles are formed on the ions.
- 6How can the trails of the ions be further observed?•By illuminating the bubbles with white light.
•Photographs can be taken from different angles to show the precise track of each particle. - 7What can be said about a particle which has a track of small curvature?•When a track has less curvature, it has greater radius.
•Consequently, it has more momentum. - 8What is a neutral particle or radiation enters the bubble chamber?•A track is not produced since neither can ionise liquid hydrogen.
- 9How can the charge of the particle in a bubble chamber be identified?•Mark the direction of the force towards the centre of the track.
•The direction of the current can be found using Fleming's LHR. - 10How can the direction of current affect the moving direction?•If direction of current = moving direction, charge type is positive.
•If direction of current is OPPOSITE moving direction, charge type is negative. - 11How can a charged particle undergo circular motion in a bubble chamber?•The moving direction of a charged particle is perpendicular to that of the magnetic field.
•The magnetic field creates a resultant force of BVQ on the charged particle. - 12Upto how many distinct tracks can be observed in a bubble chamber?•10 tracks can be observed.
- 13What occurs in track 1?•Straight track.
•The particle has a charge, but the charge type cant be detected.
•It can be detected because the track does not show any deflection.
•Particle has high momentum and energy. - 14What is track 2 and track 3?•Curved tracks.
•These tracks show low momentum charged particles compared to track 1. - 15What is the difference between track 2 and track 3?•Track 2 - curved track by negatively charged particle.
• Track 3 - curved track by positively charged particle. - 16What is track 4?•V shaped track.
•Shows the decay of a neutral particle. - 17Using the charge conservation law, explain the splitting of the neutral particle in track 4•The neutral particle splits into two oppositely charged particles.
•Hence, the charge before splitting (0) and after splitting is the same. - 18What is track 5?•Kink - sudden change in curvature.
•Indicates the decay of a charged particle. - 19Using the charge conservation law, explain track 5•A charged particle decays into another charged particle of the same charge.
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- A-Level Physics Flashcards on Particle detectors & particle accelarators, created by Jio Jenassi on 08/03/2016.
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- Jio Jenassi
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