Answer Happy

Rainbows reveal that white light is a combination of all the colours. In 1666, Isaac Newton showed that white light could be separated into its component colours using glass prisms. Soon scientists were using this new tool to analyze the light coming from several different light sources. Some scientists looked at hot objects and gases; others looked at the stars and planets. They all made observations and detected patterns, but it took about 250 years for scientists to understand the connections. Part 1: Every Element Has a Unique Signature Н. Every element emits a unique range of colours called an emission spectrum A similar spectrum is produced when light shines through a gas; however, in this case certain He colours, or wavelengths, are absorbed by the gas. An absorption spectrum is the pattern of colours and dark lines that is produced when light shines through a gas and the gas absorbs certain wavelengths. This is the same pattern that Li occurs in the emission spectrum for the same medium. Figure 1 shows some simplified absorption spectral lines. Na 운 400 450 500 550 600 650 700 Figure 1 The lines indicate the wavelengths of light that are missing from the light after passing through the sample. The weight (thickness) of the lines indicates the amount of light absorbed at that wavelength. The heavier (or thicker) the line, the more light is absorbed. 1. Scientists can use absorption spectra to analyze unknown substances. Identify the elements present in the sample that produces the spectra in Figure 2. 400 450 500 550 600 650 700 שחור 400 450 500 550 600 650 700 nm Figure 2 Simplified absorption spectra