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An electron is allowed to move freely in...

An electron is allowed to move freely in a closed cubic box of length of side 10 cm. The uncertainty in its velocity will be :

A

`3.35xx10^(-4)" m sec"^(-1)`

B

`5.8xx10^(-4)" m sec"^(-1)`

C

`4xx10^(-5)" m sec "^(-1)`

D

`4xx10^(-6)" m sec "^(-1)`

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