Advertisements
Advertisements
Question
In a cathode ray tube state the purpose of the fluorescent screen.
Advertisements
Solution
Fluorescent screen helps to obtain images on the screen by converting electrical signals to light (or) visual signals by ionizing radiations to light waves.
APPEARS IN
RELATED QUESTIONS
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.
What is meant by radioactivity?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
What are the types of emission?
State any two uses of cathode rays.
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z + 1}Y + ^0_{-1}β}\]
Two radioactive nuclei are represented by xAp and yAq and when p and q are mass numbers and x, y are the atomic number. How can the products be represented, i .e., what are the new values of p, q. x and y after the emission of an α-particle and a β-particle from A and B respectively.
It is advised not to touch a radioactive substance by hand. Give reason.
Calculate the time interval between 33% decay and 67% decay if half-life of a substance is 20 minutes.
