An atom of hydrogen has an innermost electron orbit with a radius of 5.3 × 10-11 m. What will be the radius of n = 4 orbit?

1.06 × 10-10 m 2.12 × 10-10 m 8.48 × 10-10 m 4.77 × 10-10 m

8.48 × 10-10 m

rn = n2h2ε0/mπe2  or n2r1   r1 = 5.3 × 10-11 m r4 = (4)2 × 5.3 × 10-11 m     =8.48 × 10-10 m