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Mass of a photon is given by 3.313 x 10^-34 kg. Find it’s wavelength.(a) 0.67A°(b) 0.67nm(c) 0.37A°(d) 1.67A°The question was posed to me during an interview.Question is from Towards Quantum Mechanical Model of the Atom topic in section Structure of Atom of Chemistry – Class 11

Answer»

Correct answer is (a) 0.67A°

The BEST explanation: Louis de Brogie GAVE the realation between momentum and wavelength as λ = h/p. Here h is Planck’s constant, whose value is 6.626 x 10^-34 J/s. Wavelength = h/mc = 6.626 x 10^-34 Js/(3.313 x 10^-34 KG x 3 x 10^8 m/s) = 0.67A°.



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