De-Broglie wavelength of an electron accelerated by a voltage of 50 V is close to e = 1.6 × 10 - 19 C , m e…

De-Broglie wavelength of an electron accelerated by a voltage of 50 V is close to e=1.6×10-19 C, me=9.1×10-31 kg,  h=6.6×10-34 J s
  1. 0.5 Å
  2. 1.2 Å
  3. 1.7 Å
  4. 2.4 Å

Solution

De-Broglie wavelength λ in given by  

λ=hmv=h2meV

and for electron λ=12.27 A°V

=12.27 A°50

=1.7 A°

Asked in: JEE Main 2015 (10 Apr Online)

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