Answer:
A. It has dark lines in it that allow astronomers to determine what elements are in the star.
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
An absorption spectrum can be defined as an electromagnetic spectrum transmitted through a substance (absorbing medium) giving rise to dark lines due to a decrease in the intensity or level of radiation at specific wavelengths and frequencies.
Basically, the substance absorbs energy i.e photons from the electromagnetic field.
An absorption spectrum is especially useful for astronomers because it has dark lines in it that allow astronomers to determine what elements (gases) are in the star. This is mainly due to the corresponding frequency of the electromagnetic spectrum.
A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.
It is typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He).
