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2015-10-10T03:33:14+05:30

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En = - 13.6 /n²  ev

energy is negative because the electrostatic potential energy is negative and is more than Kinetic energy. 
PE = -  9 *10^9 * Z e * e / r
         r = radius of electron orbit
KE = 1/2 m v²
momentum =  p
lambda = h/p  =>     and  wavelength is an integral multiple of circumference of its orbit.       Lambda  = 2π r * n

velocity v = lambda * nu

centripetal force =     9*10^9 * Z e * e / r²  =  m v² / r

we use the above equations and then  convert a joule into an electron volt we get the answer.
1 5 1
angular momentum m v r = n h / 2 pi. and n * lambda = 2 pi e
n lambda = 2 pi r