Star A and Star B have similar spectral type but different luminosity class. The
ID: 3309112 • Letter: S
Question
Star A and Star B have similar spectral type but different luminosity class. The difference between them is their
A. temperature.
B. radius.
C. distance.
D. color.
------------------------------
Red giants are more luminous than white dwarf stars because
A. red giants are much larger.
B. red giants are closer.
C. red giants are hotter.
D. [The statement is not true. White dwarfs are more luminous.]
E. [None of the above.]
-----------------------------------------
Most stars are
A. white dwarfs.
B. main sequence stars.
C. red giants.
D. supergiants.
E. [No general statement can be made.]
--------------------------------------------------
Assuming that each of the following stars is on the main sequence, which has the least absolute luminosity?
A. A type star
B. B type star
C. G type star
D. K type star
E. [The answer cannot be determined from the information given.]
---------------------------------------
Suppose two main sequence stars are of the same spectral class. Star X has a greater (numerical) apparent magnitude than star Y. Which star is closer to the Sun?
A. Star X
B. Star Y
C. [The question is misleading. Both stars are at the same distance from the Sun since a stars distance depends only on its spectral class.]
D. [The answer cannot be determined from the information given.]
---------------------------------------------------
The method of spectroscopic parallax uses as one of its tools
A. stellar parallax.
B. measurements of radial velocity.
C. calculations of space velocity.
D. calculations of stellar masses.
E. the H-R diagram.
---------------------------------------------
The method of spectroscopic parallax uses as one of its tools
A. A
B. O
C. G
D. M
------------------------------------------
Stars on the main sequence that have a great mass are
A. dim and cool.
B. dim and hot.
C. bright and hot.
D. bright and cool.
E. [Any of the above; there is no regular relationship.]
Explanation / Answer
1.C distance
2.A. red giants are much larger.
3.E. [No general statement can be made.] but the majority of stars on the HR diagram belongs to Main Sequence
4. luminosity: tpye B> Type A> type G > Type K. ( type K has least absolute luminosity)
5.Star Y
6. E. the H-R diagram.( uses HR diagram to estimate luminosity)
8.C. bright and hot.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.