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प्रश्न
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
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उत्तर
(i) Decrease work function.
(ii) Coating the cathode with a layer of alkaline earth metallic oxides (or) hydrides.
संबंधित प्रश्न
Why is a cathode ray tube evacuated to a low pressure?
When is said to be the nucleus unstable?
Radioactive substances were found to give off three types of rays. Name them. How do they
(a) React to the magnetic field?
(b) React to the electric field?
(c) Act when different thickness of lead sheets is placed in their path?
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 materials A and B have decay constants 25λ and 16λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of B to that of A will be "e" after a time `1/("a"lambda)` The value of a ______.
Which of the following correctly lists the three major types of radioactive decay found in nature?
In the discovery of radioactivity, why could the darkening of the covered photographic plate NOT be explained by ordinary visible light?
