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Obtain the de Broglie wavelength associ...

Obtain the de Broglie wavelength associated with thermal neutron at roon temperature `30^(@)C`.

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`T=273+30=303K, k=1.38xx10^(-23)`
Thermal neutrons kinetic theory of gases.
`therefore` Kinetic energy of a thermal neutron is given by,
`K=(3)/(2)kT=(3)/(2)xx1.38xx10^(-23)xx303=0.627xx10^(-20)J`
`lambda=(h)/(sqrt(2mK))=(6.625xx10^(-34))/(sqrt(2xx1.67xx10^(-27)xx0.627xx10^(-20)))=1.45xx10^(-10)m`
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