Question

What is the wavelength of light emmited when the electron in a hydrogen atom undergoes transition from an energy level with n=2?

Answer 1

So to emmit light it must go to lower energy level ie n=1
From Rydberg formulae we know that
$1 \div w = r(1 \div {(n2)}^{2} - 1 \div {(n1)}^{2} )$
W is the wavelength
R is the Rydberg constant
N2 and N1 are the energy level
So 1/w=r.3/4
And value of r is 1.08×10^-9m..