It is not possible to determine precisely both the position and the momentum or velocity) of a small moving particle (e.g. electron , proton, etc)
Calculate the uncertainity in velocity of a cricket ball of mass 150 g if the uncertainity in its position is of the order of 1 Å `(h = 6.6 xx 10^(-34) kgm^(2)s^(-1))`

Options

A. `3.8xx10^(-25) ms^(-1)`
B. `3.499xx10^(-24) ms^(-1)`
C. `3.8xx10^(-30) ms^(-1)`
D. `3.449 xx 10^(-30) ms^(-1)`

Answer

B

Explanation

`Delta x m Delta v = h/(4pi)`
`Delta v =(6.6xx 10^(-34))/(4xx3.14xx150xx10^(-3)) xx 1/(10^(-10))`
`= 3.499 xx 10^(-24) m//"sec"^(-1)`