Atomic Structure - Result Question 96

####72. (a) Calculate velocity of electron in first Bohr orbit of hydrogen atom (Given, r=a0 ).

(b) Find de-Broglie wavelength of the electron in first Bohr orbit.

(c) Find the orbital angular momentum of 2p-orbital in terms of h/2π units.

(2005,2M)

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Answer:

Correct Answer: 72. (98.44kJ)

Solution:

  1. (a) mvr=nh2π

v=nh2πmr=6.625×10342×3.14×9.1×1031×0.529×1010 =2.18×106ms1

(b) λ=hmv=6.625×10349.1×1031×2.18×106=0.33×109m

(c) Orbital angular momentum

(L)=l(l+1)h2π=2(h2π)

[ For p-orbital, l=1]



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