A particle of mass `1 mg` has the same wavelength as an electron moving with a velocity of `3 xx 10^(6) ms^(-1)`. The velocity of the particle is

Options

A. `2.7 xx 10^(-21) ms^(-1)`
B. `2.7 xx 10^(-18) ms^(-1)`
C. `9 xx 10^(-2) ms^(-1)`
D. `3 xx 10^(-31) ms^(-1)`

Answer

2

Explanation

`lambda = (h)/(p)`
`P_(e) = P_(p)`
`9.1 xx 10^(-31)xx 3 xx 10^(6) = 1 xx 10^(-6) u`
`v = 2.7 xx 10^(-18) m//s`