Advertisements
Advertisements
Question
State two properties that a substance should possess when used as a thermionic emitter.
Advertisements
Solution
Two properties are:
(i) High melting point. (ii) Low work function.
RELATED QUESTIONS
What happens if the negative potential is changed on a grid?
Give one example of isobars.
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.
In following fig. shows a mixed source S of alpha and beta particles in a thick lead container. The particles pass through a magnetic field in a direction perpendicular to the plane of paper (inwards as shown by x). State and show in the diagram how the particles get affected.
What do you mean by electron emission?
From α, β and γ-rays, name the one which travels with the speed of light?
Mention one important function of ear main parts:
State the principle on which the functioning of a nuclear reactor is based.
Complete the following radioactive reaction:
\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]
A deuteron strikes 8O16 nucleus with subsequent emission of an alpha particle. Identify the nucleus so produced:
