If you look at a particle under a microscope, the particle's momentum uncertainty comes from

(A) photons hitting the particle.
(B) heat vibrations of the particle.
(C) the diffraction limit of the microscope.
(D) failure to measure momentum.


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If you look at a particle under a microscope, the particle's momentum uncertainty comes from

(A) photons hitting the particle.

Yes. --- Each one transfers an unpredictable
amount of its momentum.

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If you look at a particle under a microscope, the particle's momentum uncertainty comes from

(B) heat vibrations of the particle.

No. --- That can be reduced
by cooling things down.

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If you look at a particle under a microscope, the particle's momentum uncertainty comes from

(C) the diffraction limit of the microscope.

No. --- That is what limits the particle's
position uncertainty.

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If you look at a particle under a microscope, the particle's momentum uncertainty comes from

(D) failure to measure momentum.

No. --- Measuring the momentum
would disturb the position measurement.

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