The mass of an electron is 9.1×10^-31 kg and velocity is 2.99×10^10 cm s^-1 . The wavelength of the electron will be
(1) 0.243Å
(2) 0.0243Å
(3) 4.21Å
(4) 0.421Å
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b is the answer i.e 0.0243 A
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