using the Bohr model for hydrogen: energy = hc/wavelength = 2.18 x 10^-18 Joules (1/nf2 - 1/ni2) N=15 to n=5

Energy lost is 7.63*10⁻²⁰J

Explanation:

Hello,

I think what the question is requesting is to calculate the energy difference when an excited electron drops from N = 15 to N = 5

E = hc/λ (1/n₂² - 1/n₁²)

n₁ = 15

n₂ = 5

hc/λ = 2.18*10⁻¹⁸J (according to the data)

E = 2.18*10⁻¹⁸ (1/n₂² - 1/n₁²)

E = 2.18*10⁻¹⁸ (1/15² - 1/5²)

E = 2.18*10⁻¹⁸ * (-0.035)

E = - 7.63*10⁻²⁰J

The energy lost is 7.63*10⁻²⁰J

Note : energy is lost / given off when the excited electron jumps from a higher energy level to a lower energy level