1.

An electron and a photon, each has a wavelength of 1.2Å What is the ratio of their energies ?

Answer»

`1:10`
`1:10^(2)`
`1:10^(3)`
`1:10^(4)`

Solution :`(E_(e))/(E_(ph))=((H^(2))/(2mlambda^(2)))/((HC)/(lambda))=(h)/(2m lambdac)=(1)/(100) :.lambda=(h)/(sqrt(2mE_(e)))`


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