The nature of ions knocked out from hot surfaces is
A.
protons
B.
electrons
C.
neutrons
D.
nuclei
Answer :
electrons
Solution :
In thermionic emission and other types of emission, ions emitted are atoms that has lost or gained electrons having negative or positive charge respectively. Thus, the nature of ions knocked out from hot surfaces, are electrons.
Releted MCQ Question on Modern Physics >> Dual Nature of Matter and Radiation
Releted Question 1
A particle of mass $$M$$ at rest decays into two particles of
masses $${m_1}$$ and $${m_2},$$ having non-zero velocities. The ratio of the de Broglie wavelengths of the particles, $$\frac{{{\lambda _1}}}{{{\lambda _2}}},$$ is
A proton has kinetic energy $$E = 100\,keV$$ which is equal to that of a photon. The wavelength of photon is $${\lambda _2}$$ and that of proton is $${\lambda _1}.$$ The ration of $$\frac{{{\lambda _2}}}{{{\lambda _1}}}$$ is proportional to