A) Electron
B) Photon
C) Positron
D) Proton
Correct Answer: B
Solution :
According to Planck's quantum theory of radiation, radiant energy is emitted or absorbed not continuously but discontinuously in the form of small packets of energy called quanta. In case of light quantum of energy is called photon, each photon is associated with definite amount of energy given by \[E=hv=\frac{hc}{\lambda }\] \[h=\]Planck's constant \[=6.625\times {{10}^{-34}}Js\] \[c=\] velocity of light \[v=\] frequency of wave \[\lambda =\] wavelength of wave A particle having mass equal to an electron and charge equal in magnitude as that of electron, but is positively charged is called positron \[({{e}^{+}}).\]
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