The Paschen series corresponds to transitions to n = 3. What is the wavelength of the first line?
Q1. The Paschen series corresponds to transitions to n = 3. What is the wavelength of the first line?
Answer: 1875 nm
Explanation: For the first line, n = 4 to n = 3, using 1 / λ = R * (1 / 3² - 1 / 4²) gives λ = 1875 nm.