It is not a practical proposition to take direct measurements in nanoscale, but we can estimate variations in position and momentum of particles by a)-scanning electron microscopes b)-transmission electron microscope c)-heisenberg uncertainly principle d)- none of the above

Answer is c Heisenberg's uncertainty principle

Explanation:

According to Heisenberg's uncertainty principle there is always an inherent uncertainty in measuring the position and momentum of a particle simultaneously.

Mathematically

here 'h' is planck's constant

answer:

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