Dual Nature of Radiation and Matter — Physics STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12PhysicsDual Nature of Radiation and Matter5 Marks
Question
Write down the characteristics of photons.
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Answer
Characteristics of photons: According to the particle nature of light, photons are the basic constituents of any radiation and possess the following characteristic properties: - The photons of light of frequency $v$ and wavelength $\lambda$ will have energy, given by $E=h v=\frac{h c}{\lambda}$. - The energy of a photon is determined by the frequency of the radiation and not by its intensity and the intensity has no relation with the energy of the individual photons in the beam. - The photons travel with the velocity of light and its momentum is given by $p$ - Since photons are electrically neutral, they are unaffected by electric and magnetic fields. - When a photon interacts with matter (photon-electron collision), the total energy, total linear momentum, and angular momentum are conserved. Since photon may be absorbed or a new photon may be produced in such interactions, the number of photons may not be conserved
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