Stars of spectral class M do not show strong lines of hydrogen in their spectra because. . . (a) they contain very little hydrogen. (b) their surfaces are so cool that most hydrogen is in the ground state. (c) their surfaces are so hot that most hydrogen is ionized. (d) the hydrogen lines are swamped by even stronger lines of other elements
Stars of spectral class M do not show strong lines of hydrogen in their spectra
because. . .
(a) they contain very little hydrogen.
(b) their surfaces are so cool that most hydrogen is in the ground state.
(c) their surfaces are so hot that most hydrogen is ionized.
(d) the hydrogen lines are swamped by even stronger lines of other elements
Stars of Spectral class M are commonly known as red giants. These stars are much smaller than our sun, almost 40percent of the mass of our sun. Also, the light emitted from this star is dim red. It is of such a color because the H in the stars undergo fusion slowly.
The spectral class of a star is the classification based on the spectrum obtained from the ionization of the star's elements. The hottest stars in the Universe are classified as O type of stars.
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