Table 1 gives a list of 39 ultraviolet emission lines which are found in a small portion of the Sun's spectrum. Notice, for any particular element, that a higher temperature means a greater number of electrons are missing from the ions. The emission lines in the spectrum below look like narrow mountains. Some of them are very tall, and some of them are very short. The tallest ones are the brightest emission lines, and the shortest ones are the faintest.
Every scientific measurement contains noise of some sort.
Sometimes the signal one is looking for is much stronger than the noise, and sometimes the noise can hide the signal. Summary of main ideas. Light behaves like waves which travel through space. The distance between wave peaks is the wavelength of the light. Visible light, such as the colors of a rainbow, can be seen by human eyes.