9553101
Description
Flashcards by Grace Easton, updated more than 1 year ago
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Created by Grace Easton
over 7 years ago
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| Question | Answer |
| wave theory of cathode rays | mistakenly showed that cathode rays couldn't be deflected by electric plates rays could cast shadows and be diffracted as well as cause fluorescence |
| particle theory for cathode rays | rays could charge objects negatively through interaction able to carry and transfer momentum |
| Thomson's experiment | showed that cathode rays were deflected by electric fields as well as magnetic fields by adding a magnetic field to a CRT so that the ray would pass through undetected. he equated the electric and magnetic forces (qE = qvB) to calculate the charge to mass ratio for an electron |
| electron gun in CRO | making the grid more positive or negative controls the number of electrons reaching the anodes control the intensity of the cathode ray and the brightness of the display |
| deflection system in CRO | manipulates cathode ray so useful information can be displayed consist of Y plates (horizontal, control vertical deflections) and X plates (vertical, control horizontal deflections) |
| display screen of CRO | when a beam of cathode rays strike a pixel, it glows, allowing information to be displayed displays signal as a voltage-time graph calculates amplitude & period of the wave |
| electron gun in TV set | red, green and blue guns the grid in each electron gun controls the brightness of the display. the grid and turning on/off time of a particular gun is controlled by amplified electric signals captured by an antenna receiving signals from a TV station |
| deflection system in TV set | supplied by electromagnets allow beams to be deflected through greater angles so the tube can be shorter. |
| display screen of TV | each electron gun is focused to hit a phosphor on the tube at various intensities, determining the colour at a spot on the screen |
| collimated crookes tube | magnetic field used to deflect the beam, showing the ray is charged |
| maltese cross tube | cathode rays have low penetrating power, travel in straight lines, particles not waves |
| paddle-wheel tube | have mass and momentum |
| electric plates | negatively charged |
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