16) The disk of a spiral galaxy contains many hot blue young 0 and B stars. Use

Question

16) The disk of a spiral galaxy contains many hot blue young 0 and B stars. Use Wein's Law to determine the general color you would expect disk to be? A) Yellow B) Green C) Red Di Blue 17) A logica A) it is unverified by the scientific method I claim is accepted by science B) it is fully verified by Mr. Spock C) if it is fully verified by the scientific method. D) it seems to obey my interpretation of natural laws. 18) A hot star would appear to be A) redder than a cooler star. B) more orange than a cooler star C) more infrared than a cooler star D) bluer than a cooler star. 19) Which law allows Astronomers to calculate a star's surface temperature? A) Wein's Law B) Stefan-Boltzmann's Law C) Sonin Law D) Kepler's Law 20) The sidereal day is the time it takes the Earth A) to rotate since before it starts rotating B) to rotate relative to the Sun. C) to rotate around the Sun D) to rotate relative to the back ground stars. 21) What is the source of carbon, oxygen, and nitrogen in our bodies? A) They were formed in stars and ejected into space during the death processes of stars B) They have been produced in the Sun C) These elements have been produced by radioactive decay D) These elements were made before the Big Bang. 22) A star on the horizontal branch of the HR diagram is A) fusing carbon. B) fusing helium. C) fusing hydrogen. D) fusing Iron 23) What generally happens to the Earth's elimate when sunspot activity decreases? A) The Earth's temperature increases B) The Earth's temperature decreases. C) The Earth's temperature stays the same D) Sunspots have no effect on the Earth's climate.

Explanation / Answer

16) D

17) C

it should be verified scientifically, repeatable and reproducable

18)D

as the temperature increases wavelength of emission decreases.

19) A

from the temperature wavelength relation, we can found out the temperature of a star from its emited wavelength

20) D

relative to a fixed star

21) A

elements heavier than helium is formed inside the star at high temperature and after the supernova explosions it spread over the surroundings.

22) fusing helium

23)B

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