What is the de-Broglie wavelength of (a) a bullet of mass 0.040kg travelling at the speed of `1.0kms^(-1)`. (b) a ball of mass 0.060 kg moving at a speed of `1.0ms^(-1)` and (c) a dust particle of mass `1.0xx10^(-9) kg` drifting with a speed of `2.2 ms^(-1)`? `h=6.63xx10^(-34)Js`.

Explanation

(a) `lambda=h/(mv) =(6.63xx10^(-34))/((0.040)xx(1.0xx10^(3)))=1.66xx10^(-35)=1.7xx10^(-35)m`
(b) `lambda=(6.63xx10^(-34))/((0.060)xx1.0)=1.1x10^(-32)m` (c) `lambda=(6.63xx10^(-34))/((1.0xx10^(-9))xx2.2)=3.0x10^(-25)m`