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प्रश्न
Why is a cathode ray tube evacuated to a low pressure?
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उत्तर
The cathode ray tube is evacuated to a low pressure to avoid collisions of electrons with air molecules.
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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
Arrange α, β, and γ rays in ascending order with respect to their
1) Penetrating power.
2) Ionising power
3) Biological effect
Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field
Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C.
1) Name the radiation B which is unaffected by the electrostatic field.
2) Why does the radiation C deflect more than A?
3) Which among the three causes the least biological damage externally.
4) Name the radiation which is used in carbon dating.
State the penetrating range of α, β and γ radiations.
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
During the emission of a beta particle, the ______ number remains same.
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
