Question

Calculate the radius of the first second and third bohr orbits of hydrogen ?

Answer 1

radius of bohr orbit i=0.529n^2/z
as for hydrogen z=1
  1st orbit=0.529
  2nd orbit n=2 and z=1 so =2.116
 3rd orbit n=3 and z=1 so=4.775

Answer 2

Explanation:

Bohr radius is given by:

$r_n=0.529\times \frac{n^2}{Z} \AA$

n = number of energy level

Z = 1 u

Radius of first energy level = n = 1

$r_1=0.529\times \frac{1^2}{1} \AA=0.529 AA$

Radius of second energy level = n = 2

$r_1=0.529\times \frac{2^2}{1} \AA=2.116 \AA$

Radius of third energy level = n = 3

$r_1=0.529\times \frac{3^2}{1} \AA=4.761 \AA$