AP EAMCET · Chemistry · Structure of Atom

If uncertainity in the measurement of position and momentum of a microscopic object of mass $' m'$ are equal, then the uncertainity in the measurement of velocity is given by the expression

A $\sqrt{\frac{h}{4 πm}}$
B $\sqrt{\frac{h}{4 π}} \times \frac{1}{m}$
C $\frac{h}{4 π} \times \sqrt{\frac{1}{m}}$
D $\sqrt{\frac{h}{2 πm}}$

Verified Solution

Answer & Solution

Correct Answer

(B) $\sqrt{\frac{h}{4 π}} \times \frac{1}{m}$

Step-by-step Solution

Detailed explanation

∆x∆p=h4π∆x=∆p=h4π∆p =m∆v m∆v =h4π∆v =1mh4π

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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If uncertainity in the measurement of position and momentum of a microscopic object of mass 'm' are equal, then the uncertainity in the measurement of velocity is given by the expression

Step-by-step Solution

If uncertainity in the measurement of position and momentum of a microscopic object of mass $' m'$ are equal, then the uncertainity in the measurement of velocity is given by the expression