The wavelength of light from the spectral emission line of sodium is 589nm. Find the kinetic energy at which (a) an electron and (b) a neutron would have the same deBroglie wavelength. Given that mass of neutron`=1.66xx10^(-27)kg`

Explanation

(a) `lambda=h/(sqrt(2Km)) of K=(h^(2))/(2lambda^(2)m)`
For electron, `K=((6.63xx10^(-34))^(2))/(2xx(589xx10^(-9))^(2)xx9xx10^(-31))=7.03xx10^(-25)J`
For neutron, `K=((6.63xx10^(-34))^(2))/(2xx(589xx10^(-9))xx1.66xx10^(-27))=3.81xx10^(-28)J`