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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