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If the kinetic energy of an electron is 5J. Find out its wavelength.(a) 0.313 x 10^15 m/s(b) 3.013 x 10^15 m/s(c) 3.310 x 10^15 m/s(d) 3.313 x 10^15 m/sThe question was asked in examination.This question is from Towards Quantum Mechanical Model of the Atom topic in division Structure of Atom of Chemistry – Class 11

Answer»

The correct choice is (d) 3.313 x 10^15 m/s

For explanation I would SAY: We know that the mass of an ELECTRON is 9.1 x 10^-31 kg. Given that the kinetic ENERGY of an electron is 5J. K.E = mv^2/2 and by SUBSTITUTING we get v = √1.098 x 10^31 m/s = 3.313 x 10^15m/s.



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