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प्रश्न
What do you mean by electron emission?
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उत्तर
Free electrons leave the metal surface only if sufficient energy is supplied to the metal. This emission of electrons from metal surface is called the electron emission.
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
What do you mean by Mass number.
Name two radioactive substances.
State any two uses of cathode rays.
In a cathode ray tube state the purpose of the fluorescent screen.
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.
A radioactive material decays by simultaneous emissions of two particles with half-lives of 1400 years and 700 years respectively. What will be the time after which one-third of the material remains? (Take In3 = 1.1)
