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Question

The uncertainity in position of an electron and helium atom are same. If the uncertainity in momentum for the electron is 32×105, then the uncertainity in momentum of helium atom will be__________.

A
32×105
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B
16×105
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C
8×105
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D
None
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Solution

The correct option is A 32×105
According to Heisenberg's Uncertainity principle:
Δx.Δph/4π
therefore for a known amount of uncertainty in position, all particles will have same uncertainty in momentum.
given Δpe=32×105
thus, ΔpHe=32×105
option A is correct

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