Advertisements
Advertisements
प्रश्न
Define the work function of a metal. Give its unit.
Advertisements
उत्तर
The minimum energy needed for an electron to escape from the metal surface is called the work function of that metal. Its unit is electron volt (eV).
APPEARS IN
संबंधित प्रश्न
Find the maximum frequency of X-rays produced by 30 kV electrons.
Find the (a) maximum frequency and (b) minimum wavelength of X-rays produced by 30 kV electrons.
Quarks inside protons and neutrons are thought to carry fractional charges [(+2/3)e; (–1/3)e]. Why do they not show up in Millikan’s oil-drop experiment?
Would you prefer a material with a high melting point or a low melting point to be used as a cathode in a diode?
A diode value is connected to a battery and a load resistance. The filament is heated, so that a constant current is obtained in the circuit. As the cathode continuously emits electrons, does it become more and more positively charged?
Why does thermionic emission not take place in non-conductors?
Answer the following question.
Define the term "Threshold frequency", in the context of photoelectric emission.
Why do metals have a large number of free electrons?
What do you mean by electron emission? Explain briefly various methods of electron emission.
In which case is electron emission from a metal not known?
