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RELATED QUESTIONS
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
How can they be made to leave the metal surface? (State any two ways)
Name the unit in which the work function of a metal is expressed.
Name two radioactive substances.
Define free electrons.
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z + 1}Y + ^0_{-1}β}\]
State three ways of obtaining an electron-beam.
The mean lives of a radioactive substance are 1620 and 405 years for β-emission and β-emission respectively. The time after which three fourth of a sample will decay if it is decaying both by β-emission and β-emission simultaneously will be ______ years.
(Take ln 2 = 0.693)
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
