Question

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Answer 1

Electromagnetic waves have many different wavelengths and frequencies that span a range known as the electromagnetic spectrum Light of different wavelengths produces different perceptions of color. The longest wavelengths produce the perception of red, while the shortest ones produce the perception of violet.

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Answer 2

• From different wavelengths we can create a electromagnetic spectrum .
• From spectral lines of that electromagnetic spectrum astronomers can determine the element in the farther universe (star).
• They can also determine the temperature and density of that element in the star.
• The spectral lines in the electromagnetic spectrum tell us about any magnetic field of the star.

A useful formula of wavelength:

$\\ \sf\longmapsto \lambda=\dfrac{c}{v}$