# NEET Questions Solved

NEET - 2008

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of . The velocity of the particle is

(a) 2.7

(b)

(c)

(d)

(mass of electrons =$9.1×{10}^{-31}kg$)

Wavelength of a particle is given by

$\lambda =\frac{h}{p}$

where h is Planck's constant and wavelength of an electron is given by

${\lambda }_{e}=\frac{h}{{p}_{e}}$

but                 $\lambda ={\lambda }_{e}$

so,               p=${p}_{e}$

or                mv=$\frac{{m}_{e}{v}_{e}}{m}$

or           $v=\frac{{m}_{e}{v}_{e}}{m}$

putting the under given data

Difficulty Level:

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