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Why is a cathode ray tube evacuated to a low pressure?
Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field
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.
Why are materials of low work function preferred as thermionic cathode materials?
From α, β and γ-rays, name the one which is not affected by electric or magnetic field?
State one use of radio-isotopes.
Mention four properties of Becquerel rays.
The activity of a certain radionuclide decreases to 15 percent of its original value in 10 days. What is its half life?
[ln (0.15) = -1.9]
Which type of radioactive emission is strongly ionising in nature?
