Question

Given: The mass of electron is `9.11 × 10^(–31)`Kg Planck constant is `6.626 ×10^(–34)`Js, the uncertainty involved in the measurement of velocity within a distance of 0.1Å is:-
A. `5.79xx10^8 "ms"^(-1)`
B. `5.79xx10^5 "ms"^(-1)`
C. `5.79xx10^6 "ms"^(-1)`
D. `5.79xx10^7 "ms"^(-1)`

Answer 1

Correct Answer - C
`Deltax.mDetlav=h/(4pi)`
`0.1xx10^(-10) xx 9.11xx10^(-31)xx Deltav=(6.626xx10^(-34))/(4xx3.14)`
`Deltav=(6.626xx10^(-34)) /(0.1xx10^(-10)xx 9.11xx10^(-31)xx4xx3.14)`
`5.79xx10^6` m