NEET Physics Atoms Questions Solved

As the electron in Bohr orbit of Hydrogen atom passes from state n = 2 to n = 1 , the kinetic energy K and potential energy U change as 
(a) K two-fold, U four-fold
(b) K four-fold, U two-fold
(c) K four-fold, U also four-fold
(d) K two-fold, U also two-fold

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