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Q)

Uncertainty in the position of an electron (mass $9.1 \times 10^{-31} kg$) moving with a velocity $300\; ms^{-1}$, accurate upon $0.001 \%$ will be : <br> ($ h = 6.63 \times 10^{-34} Js$)


( A ) $19.2 \times 10^{-2} m$
( B ) $1.92 \times 10^{-2} m$
( C ) $3.84 \times 10^{-2} m$
( D ) $5.76 \times 10^{-2} m$

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A)
Ans is 1.92×10-² v=300×0.001%=0.003m/s x=h/(4×3.14×m×v) =6.63×10-³⁴/(4×3.14×9.1×10‐³¹×0.003) =1.933 ×10-² ~ 1.92× 10-² m
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