Question

According to the uncertainty principle for an electron, time measurement will become uncertain if which of the following is measured with high certainty?

(a) Energy

(b) Momentum

(c) Location

(d) Velocity

The question was asked during an interview.

I'd like to ask this question from Atomic Spectra in section Atoms of Physics – Class 12

Answer 1

The correct choice is (a) Energy

To explain I would say: According to the uncertainty principle,

ΔE.Δt >= \(\frac {h}{2\pi }\).

Thus the time measured will become uncertain if ΔE is measured with high certainty.