Question

What is the wavelength of light emitted when an electron in hydrogen moves from n=3 to n=2?

Answer 1

1/λ = 1.096776*10^7 m-1 {1/3^2-1-2^2}

1/λ = 1.096776*10^7 m-1(0.11-0.25)

1/λ = 1.096776*10^7 m-1*(-0.14)

1/λ =- 0.154 *10^7 m-1

λ= - 6.49 *10^10^-7 m

λ= - 6.49 *10^10^-7 m *10^9 nm/1.0 m

λ= - 649 nm

here – sign show that emission of wavelength.