Which of the following statement/s is/are correct? Maximum value of `14C_r`. is when `r=7`.

Which of the following value of R is not correct ?

Which of the following statement is correct w.r.t. the following graph?

Which of the following statement is correct w.r.t. the following graph ?

Which of the following statement is correct w.r.t. the following graph ?

Which of the following statement (s) is/are correct with respect to Psi(r) (y-axis) us r (x-axis) graph for H-atom ?

Which of the following is the correct value of R in SI units ?