Advertisements
Advertisements
प्रश्न
How is a zinc sulphide screen affected when a cathode ray beam strikes it?
Advertisements
उत्तर
When a cathode ray beam strikes a zinc sulphide screen, a bright spot is seen on the screen.
संबंधित प्रश्न
What is thermionic emission?
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.
When is said to be the nucleus unstable?
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
Name two radioactive substances.
A radioactive substance is oxidized. What changes would you expect to take place in the nature of radioactivity? Explain your answer.
In a cathode ray tube state the purpose of the fluorescent screen.
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z - 2}X + ^4_{2}He}\]
An electrons emitter must have how much work function and melting point.
It is advised not to touch a radioactive substance by hand. Give reason.
