To determine how many wavelengths of yellow-green light fit into a 0.500 mm space, first calculate the wavelength using the formula wavelength = c/f, where c is the speed of light and f is the frequency. Given a frequency of 5.50 x 10^14 Hz, the wavelength is found to be approximately 5.45 x 10^-7 m. Next, convert 0.500 mm to meters, which is 0.0005 m, and divide this distance by the wavelength to find the number of wavelengths that can fit. The discussion emphasizes understanding the relationship between frequency and wavelength rather than merely manipulating equations. This conceptual clarity is crucial for solving the problem effectively.