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प्रश्न
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
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उत्तर
(i) Decrease work function.
(ii) Coating the cathode with a layer of alkaline earth metallic oxides (or) hydrides.
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संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
Name a gas caused by the Greenhouse effect
In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.
What do you mean by Atomic mass
What kind of change takes place in a nucleus when a β -particle is emitted?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
A nucleus is \[\ce{^24_11 Na}\] β-radioactive.
Write the equation represent β-decay.
State two properties that a substance should possess when used as a thermionic emitter.
If 10% of a radioactive substance decays in every 5 years, then the percentage of the substance that will have decayed in 20 years will be ______.
