CGPET 2019 Solved Paper

According to uncertainty principle, It is impossible to determine simultaneously, the exact position and momentum (or velocity) of an moving electron.
Mathematically Δx.Δp≥

h

4π

Given, when,
Δx=Δp
where, Δx= uncertainty in position.
Δp= uncertainty in momentum and
Δp=mΔv
where, Δv= uncertainty in velocity and
m= mass of electron
m.Δ=Δx
or, m2Δv2=

h

4π

or Δv2=

1

2m

√

h

π

Hence, option (c) is the correct answer.