Advertisements
Advertisements
Question
State three common properties of beta rays and cathode rays.
Advertisements
Solution
(i) Beta rays and cathode rays both are composed of electrons.
(ii) Beta rays and cathode rays both are deflected by the electric and magnetic fields in the same direction.
(iii) Beta rays and cathode rays both ionise the gas through which they pass.
RELATED QUESTIONS
Represent the change in the nucleus of a radioactive element when a β particle is emitted.
An electromagnetic radiation is used for photography in fog. [2]
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose ?
Draw a diagram of a simple atom showing the nucleus and electrons. In this atom:
(a) What type of charge will there be on the nucleus?
(b) What is the value of this charge?
Why should a radioactive substance not be touched by hands?
In a cathode ray tube state the purpose of the fluorescent screen.
What is meant by Radioactivity?
It is advised not to touch a radioactive substance by hand. Give reason.
Unit of radioactivity is _______
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
Assertion (A): Hydrogen atom consists of only one electron but its emission spectrum has may lines.
Reason (R): Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.
