r8ppie Q&A
An astronomer whose secret hobby is riding merry-go-rounds has dedicated his career
to finding the stars that rotate the most rapidly. But the stars are all very far away, so
none of them can be seen to spin even when he looks through the largest telescopes.
How then can he identify the stars that rotate rapidly? - (correct answer)stars that rotate
have much wider lines in their spectra than stars that do not
When an astronomer rambles on and on about the luminosity of a star she is studying,
she is talking about: - (correct answer)how much energy the star gives off each second
If hydrogen is the most common element in the universe, why do we not see the lines of
hydrogen in the spectra of the hottest stars? - (correct answer)In the hottest stars,
hydrogen atoms are ionized, and so there are no electrons to produce lines in the
spectrum.
The star named Sheat is of M2 II spectral type and luminosity class. Based on this
information, which of the following are true?
I. Sheat has a surface temperature less than the sun.
II. Sheat has a diameter that is greater than that of the sun.
III. Sheat is more luminous than the sun.
IV. Sheat is located near the upper left hand corner in the HR diagram. - (correct
answer)I, II, & III
One similarity in the spectra of T dwarf stars and giant planets in our solar system is that
their spectra show: - (correct answer)indications of methane
The spectral types for each of five stars are given. Which star in would have the
greatest surface temperature? - (correct answer)x Per; O7
An astronomer whose secret hobby is riding merry-go-rounds has dedicated his career
to finding the stars that rotate the most rapidly. But the stars are all very far away, so
none of them can be seen to spin even when he looks through the largest telescopes.
How then can he identify the stars that rotate rapidly? - (correct answer)stars that rotate
have much wider lines in their spectra than stars that do not
When an astronomer rambles on and on about the luminosity of a star she is studying,
she is talking about: - (correct answer)how much energy the star gives off each second
If hydrogen is the most common element in the universe, why do we not see the lines of
hydrogen in the spectra of the hottest stars? - (correct answer)In the hottest stars,
hydrogen atoms are ionized, and so there are no electrons to produce lines in the
spectrum.
The star named Sheat is of M2 II spectral type and luminosity class. Based on this
information, which of the following are true?
I. Sheat has a surface temperature less than the sun.
II. Sheat has a diameter that is greater than that of the sun.
III. Sheat is more luminous than the sun.
IV. Sheat is located near the upper left hand corner in the HR diagram. - (correct
answer)I, II, & III
One similarity in the spectra of T dwarf stars and giant planets in our solar system is that
their spectra show: - (correct answer)indications of methane
The spectral types for each of five stars are given. Which star in would have the
greatest surface temperature? - (correct answer)x Per; O7
