In: Physics
1. (a) Use Rydberg formula to calculate the wavelengths of the four visible lines in the Balmer series of light emitted by a hydrogen gas-discharge lamp. A diffraction grating of width 1 cm has 2500 slits. It is used to measure the wavelengths of the visible spectrum of hydrogen.
(b) Determine the first-order diffraction angles of the four observed lines.
(c) What is the angular width of each one of them?