Which of the following statements are correct?

Options

A. Total number of nodes including the one that occurs at `r=oo`, will be =n
B. If the uncertainties in the velocity and momentum are equal then the uncertainty in velocity `=1/(2m)sqrt(h/(pi))`
C. If the potential energy of an electron in 1st shell fo H-atom =-54.4 eV the I.E of electron is 27.2 eV
D. If the potential energy of an electron in 1st shell of H-atom =-54.4eV. Then the enerty required to remove the electron from the 2nd shell will be 6.8eV.

Answer

A, B, C, D

Explanation

Total no. of nodes `=n-1`
When the one that occurs at `r=alpha` is taken total member of modes `=n=l+1=n`,
`(T.E.)/(D.E.)=1/2` also `E_(n(H))=(Z^(2))/(n_(2))xxE_(1)`
Hence A,B, C and D are the correct answer.