Question

in rydberg equation , spectral line correspond s to n=3 and n=5. calculate the wavelrnght, frequencyof spectral line

Answer 1

rydberg equation  (Rydberg constant =1.097x10^7)
$\frac{1}{λ} =R_H( \frac{1}{n_1^2} -\frac{1}{n_2^2} )$
$\frac{1}{λ} =R_H( \frac{1}{9} -\frac{1}{25} )$
$\frac{1}{λ} =R_H( \frac{16}{225})$ 
$\frac{1}{λ} =\frac{7020800}{9}$ 
λ=1.282x10^6 

Wavelength =1.282x10^6

f=$\frac{c}{λ}$   (c=3.00x10^8)
f=2.34x10^14hz