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A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3×106 ms-1. The velocity of the particle is 

(a) 2.7×10-18 ms-1

(b) 9×10-2 ms-1

(c) 3×10-31 ms-1

(d) 2.7×10-21 ms-1

(mass of electrons =9.1×10-31kg)

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