1.

A free electron was initially confined within a region with linear dimensions l=0.10nm. Using the uncertinty principle evaluate the time over which the width of the corresponding trin of waves becomes eta=10 time s as large.

Answer»

Solution :Initial uncertainty `Deltav OVERSET(~) gt (ħ)/(ml)`. With this incertainty the wave train WIL spread out to a distance `eta l` LONG in time
`t_(0)~~etal//(ħ)/(ml)~~(etaml^(2))/(ħ)SEC.=8.6xx10^(6)sec~10^(-15)sec`.


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