1.

According to classical physics, the kinetic energy K of an electron revolve in orbit of radius r is ........

Answer»

`(1)/(8piin_(0)).(Ze^(2))/(R)`
`(1)/(4piin_(0)).(Ze^(2))/(r)`
`-(1)/(8piin_(0)).(Ze^(2))/(r)`
`-(1)/(4piin_(0)).(Ze^(2))/(r)`

Solution :For circular motion of electron in atom,
CENTRIPETAL force = Coulombian force
`(MV^(2))/(r)=(1)/(4piin_(0)).((Ze)(e))/(r^(2))`
`:.(1)/(2)mv^(2)=(1)/(8piin_(0)).(Ze^(2))/(r)`
`:.K=(1)/(8piin_(0)).(Ze^(2))/(r)`


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