Structure of Atom — Chemistry STD 11 Science — Question
Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom2 Marks
Question
Calculate the mass of photon with wavelength 5pm.
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Answer
m = ? C = velocity of photon = velocity of light = 3 × 108ms-1 $\lambda=5\text{pm}=5\times10^{-10}\text{m}$ using de Broglie equation, $\lambda=\frac{\text{h}}{\text{mc}}$ $5\times10^{-10}=\frac{6.626\times10^{-34}\text{Js}^{-1}}{\text{m}\times3\times10^8\text{ms}^{-1}}$ $\text{m}=\frac{6.626\times10^{-34}}{5\times10^{-10}\times3\times10^8}$ $=\frac{6.626}{15}\times10^{-34+10-8}=\frac{6.626\times10^{-32}}{15}$ $\text{m}=\frac{66.26}{15}\times10^{-33}\text{kg}$ $=4.417\times10^{-33}\text{kg}$
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