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23 Cards in this Set
- Front
- Back
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Indian who postulated parmanu
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Maharishi Kanad
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Which greek person called the particles atoms
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Democritus
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The work of Democritus was rejected because it was based on philosophical considerations and there was no experimental work to validate it
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First definite theory of structure of matter was put forth by
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First definite theory of structure of matter was put forth by
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According to daltons atomic theory matter is composed of structureless hard spherical particles called atoms
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Daltons atomic theory was rejected because of
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Experimental observations made by scientists showed that atom consists of subatomic particles
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when electricity is passed through a solution of an electrolyte, chemical reactions occ. at the electrodes which results in liberation and deposition of matter at the electrodes
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Faradays's First Law
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Fixed amount of electricity-Fixed amount of substance
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Faradays's Second Law
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Number of moles of various substances- fixed amount of electricity- simple ration- 96500- NaCl- 2:1
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Stoney proposed that
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Electricity is composed of small discrete units called electrons
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Discharge tube experiments describe the concept-
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ordinary conditions-poor conductors- but high voltage+low pressure- conducts in form of cathode rays
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Discharge Tube/Crookes tube
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1) electrodes
2) Side tube Vaccum 3) gas 4) voltage |
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What is observed at
1)high voltage 2) 10(-2) 3) 10(-4) |
1) nothing
2) conduction colour depending on gas 3) no glow fluoroscence |
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Fluorosecnt substance
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Zinc Sulphide
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Properties Of Cathode Rays
direction, confirmation how done and way of traveling |
cathode to anode, wall opposite cathode, satringht line because there is shadow
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Properties Of Cathode Rays
Florescence how to observe- used where |
coating with zinc sulhide and in television sets
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Properties Of Cathode Rays
Mechanical effects |
rotates the paddle wheel
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Properties Of Cathode Rays
Mechanical Electrical |
towards positively charged plate
correspoding magnetic movement |
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Properties Of Cathode Rays
Heating Effects |
When they strike a meta foil it heats up
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Properties Of Cathode Rays
X rays |
Stike against hard metals like tungsten copper
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Properties Of Cathode Rays
Penetration |
Can pass through thin sheets of aluminium
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Properties Of Cathode Rays
Effect of Photographic Plates |
yes
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Properties Of Cathode Rays
Depends/does not depend on |
mass and charge of the gas
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