1.

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

Answer»

`1.82 xx 10^(-18) ms^(-1)`
`9 xx 10^(-2) ms^(-1)`
`3 xx 10^(-31) ms^(-1)`
`1.82 xx 10^(-15) ms^(-1)`

Solution :de-Broglie wavelength of electron
`lambda = (h)/(mv) = (6.63 xx 10^(-34))/(9.1 xx 10^(-31) xx 6 xx 10^(6)) = 1.214 xx 10^(-10)`m
Velocity of the PARTICLE
`v = (h)/(m lambda) = (6.63 xx 10^(-34))/(3 xx 10^(-9) xx 1.214 xx 10^(-10)) = 1.8204 xx 10^(-15) ms^(-1)`


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