the color of a star could be a indication of the?

Question

a.)rate of fusion reactions
b.)age of the star
c.)size of the star
d.)all of the above
e.)b and c
f.)none of the above

Answer 1

That's a silly question because the correct answer really depends on the context.

As and of itself - without additional parameters know - the color can't indicate any of those; the only thing that correlates with color irrespective of other parameters is effective temperature.

As soon as you know additional parameters, color can be an indication of all of them. (Depending on what else you know.)

So technically, as there's no context, I'd say d and f are simultaneoulsy correct. (Say hi to Schroedinger's cat for me.)

Edit:
Looking at some of the incorrect answers, to clarify:

Without additional information known:
Blue could be a white dwarf (burnt out, old, tiny); it could be a O type massive hypergiant (extremely high reaction rate, extremely young, large).

Red could be a barely stellar M subdwarf (low reaction rate, might be a fledgeling or as old as the galaxy itself, tiny); it could be an red supergiant (fairly high shell burning rate, fairly young, enormous).

Answer 2

All of the Above. The light given off through the fusion reaction can be separated out through a prism. Measuring the bands of color you can see what elements are burning. Through that you can figure out the age. I would disagree with C. but D. is the only one that combines both A. and B.

Answer 3

fairly, the colour of a megastar is an illustration of the temperature of its photosphere. this relies upon, of direction, on the fee of fusion reactions occurring which relies upon on the size (mass) of the megastar yet additionally on its composition which, to an volume, relies upon on its age. So, badly worded nevertheless it grew to become into, the main suitable answer to the question is 'D'.

Answer 4

d-all of the above

for example: bblue stars

a. burn at the highest temperatures (10,000 degrees celsius), and have faster nuclear fusion, giving off more light and energy
b. are youngest (0-1000000) years old (stars change colour as they grow older)
c. smallest stars

by comparison, red stars:

a. burn at a temperature of 1000-4000 degrees celsius

b. are between 10-100 million years old

c. are the largest stars

Answer 5

A - color of a star shows how hot it is, and how fast fusion reactions are occuring

Answer 6

rate of fusion reaction

Answer 7

Shouldn't you also consider relative velocities/red-shift ?

Answer 8

e

Answer 9

e

Answer 10

A.