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Question

If the uncertainty in the velocity of a moving object is 1.0×106ms1 and the uncertainty in its positions is 58 m, the mass of this object is approximately equal to that of:

[h=6.626×1034Js]

  1. helium
  2. deuterium
  3. lithium
  4. electron

A
deuterium
B
lithium
C
electron
D
helium
Solution
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Δx×m×Δv=h4π58×m×1.0×106=6.626×103443.1416m=9.091×1031kg

It is equal to the mass of an electron.

Hence, option C is the correct answer.

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