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A neutron is an unchanged particle of ma...

A neutron is an unchanged particle of mass `1.67xx10^(-27) kg`. Calculate the de-Broglie wavelength of the neutron moving with a velocity, such that K.E. is 0.04 eV, `h=6.62xx10^(-34)Js`.

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The correct Answer is:
`1.43Å`
K.E. of neutron, `K=1/2mv^(2) or mv=sqrt(2mK)`
`lambda=h/(mv)=h/(sqrt(2mK))`
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