A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of $3\times10^ 6 ms^{–1}$. The velocity of the particle is : (mass of electron = $9.1\times10^{–31}$ kg)

Question

( A ) $2.7\times10^{-18}ms^{-1}$
( B ) $3\times 10^{–31} ms^{–1}$
( C ) $9 \times10^{–2} ms^{–1}$
( D ) $2.7 \times10^{–21} ms^{–1}$