Question

In Bohr’s model of hydrogen atom, the radius of the first electron orbit is 0.53 Å. What will be the radius of the third orbit? 

(a) 4.77 Å 

(b) 47.7 Å 

(c) 9 Å

(d) 0.09 Å

Answer 1

(c) 9r₀

r_n = r₁ n² , where r₁ = r₀ 

∴ v₃ = r₀ (3)² 9r₀