InterviewSolution
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InterviewSolution
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If The Momentum Average Is Zero Then Δp Must Be Zero. Then Shouldn’t Δx → ∞? |
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Answer» <P>No. Just because (p) = 0 doesn’t NECESSARILY mean that Δp = 0. For the “stationary” states in the well the magnitude of the MOMENTUM is not on average zero. We know this because we CALCULATED (P2) and found that was not zero. Also remember this is the same as saying the particle has kinetic energy, which it does. The reason (p) = 0 is because on average the particle is moving to the right the same amount of time it is moving to the left. No. Just because (p) = 0 doesn’t necessarily mean that Δp = 0. For the “stationary” states in the well the magnitude of the momentum is not on average zero. We know this because we calculated (p2) and found that was not zero. Also remember this is the same as saying the particle has kinetic energy, which it does. The reason (p) = 0 is because on average the particle is moving to the right the same amount of time it is moving to the left. |
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