Question

The ratio of the radius of 3rd Bohr orbit in hydrogen atom to the radius of 1st Bohr orbit is:-

Answer 1

Answer:

Atomic number Z is equal to 1.

Hence the radius of nth orbit, rn=0.529n2A

For first three orbits, n values are 1,2 and 3

ratio of radii of first three orbit r1:r2:r3=n12:n22:n32

⇒12:22:32⇒1:4:9