Question

Calculate the radii of first three of bhor orbut of hydrogen

Answer 1

Atomic number ,z is equal to 1.

Hence the radius of nth orbit rn=0.529n2A

For first three orbits , n values are 1,2and3

ratio of radii of first three orbit = r1:r2:r3=n21:n22:n23

=> 12:22:32

=> 1:4:9

Answer : 1:4:9

Answer 2

it's simple formula

"n^2(0.53 A')

1. radius of first bohr orbit is 0.53 A'

2. radius of second bohr orbit is 4(0.53 A')

3. radius of third bohr orbit is 9(0.53 A')