Advertisements
Advertisements
Question
An electrons emitter must have how much work function and melting point.
Advertisements
Solution
An electron emitter must have low work function and high melting point.
RELATED QUESTIONS
State three factors on which the rate of emission of electrons from a metal surface depends
In a cathode ray tube, what is the function of anode?
State the penetrating range of α, β and γ radiations.
Name two radioactive substances.
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.
During the emission of a beta particle, the ______ number remains same.
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
State one use of radio-isotopes.
Two radioactive sources A and B of half lives of 1 hour and 2 hours, respectively, initially contain the same number of radioactive atoms. At the end of two hours, their rates of disintegration are in the ratio of ______.
Calculate the time interval between 33% decay and 67% decay if half-life of a substance is 20 minutes.
