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Q.

The measurement of the electron position is associated with an uncertainty in momentum,   which is equal to  1 × 10-18g - cm/s. The uncertainty in electron velocity is (mass of an electron  is 9 × 10-28g)

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a

1 × 109 cms-1

b

1 × 106cm s-1

c

1 × 105 cm/s-1

d

1 × 1011cm s-1

answer is A.

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Detailed Solution

Given , 

ΔP = 1 × 10-8g cm s-1

(uncertainty in momentum)

Mass = 9 × 10-28g

ΔP = mΔv

1 × 10-8 = 9 ×10-28 × Δv (uncertainty in velocity)

Δv = 1 × 109 cms-1

 

 

 

 

 

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