constructive interference occurs. Calculations and Predictions: You are given a diffraction grating with 7500 lines per cm. You illuminate the grating with 589.3 mm wavelength yellow light. You observe a bright spot along the central axis (m = 0) and at several other places (where m = 0) away from the axis on a screen. 1) What is the slit spacing? d= [m] 2) At what angle will the first-order maximum be found? 8 = [degrees] 0OO (Make sure you use enough significant figures to get at least two decimal places accuracy for the angle of the first maximum.) The instrument you will use to distinguish spectral emission lines of different wavelengths is known as a diffraction grating spectrometer. You will use it to analyze the emission lines from low-pressure, gaseous samples of various atomic elements contained in sealed glass tubes - known as gas electric-discharge tubes. A strong electric potential is placed across electrodes at the ends of the tubes. The voltage generates an electric current (of electrons) flowing through the gas. Some of these electrons collide inelastically with the atoms in the gas, sending those atoms into excited states. The atoms then emit light as they fall from their excited states. Since the energy levels of the atom are quantized, the light emitted is of fixed and characteristic frequencies