How Do the Temperatures of Star 1 and Star 2 Compare?

AI Thread Summary
Star 1 emits energy at twice the rate of Star 2 and has a radius three times larger, indicating that its temperature can be compared using the Stefan-Boltzmann law. The discussion highlights that a star's energy emission is influenced by both its temperature and surface area. A larger surface area allows for greater energy emission, while higher temperatures result in increased radiation output. Participants express confusion over the lack of provided equations for solving the problem. The key takeaway is that the relationship between energy output, surface area, and temperature is crucial for understanding the comparison of the two stars.
DracoMalfoy
Messages
88
Reaction score
4

Homework Statement


Star 1 emits energy at a rate that is 2 times that of Star 2. If Star 1 also has a radius that is 3 times larger than Star 2, how do the temperatures of the stars compare?

a. Star 1's temperature is 2.58 that of Star 2.

b. Star 1's temperature is 3.75 that of Star 2.

c. Star 1's temperature is 0.69 that of Star 2.

d. Star 1's temperature is 0.37 that of Star 2.

e. Star 1's temperature is 0.12 that of Star 2.

Homework Equations

The Attempt at a Solution



This is supposed to be a physics class.. I am not sure why we were given this question. The teacher didnt even give us any equations for questions like this. so i have no idea,.. pls help
 
Physics news on Phys.org
well Physics is about objects in the real world :biggrin:
jokes aside, a star emits electromagnetic radiation from its surface due to the temperature of the (very hot :smile:) material - similar to a hot filament in a light bulb.
hotter material will emit more radiation energy per unit time.
a larger star will have more surface area and thus also emit more energy per unit time.
so the amount of radiation energy emitted per unit time will depend on the temperature and the amount of surface area of the star.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Calculating the distance to a star
Replies
1
Views
1K
How Does the Brightness and Temperature of l Carinae Change with Its Pulsations?
Replies
15
Views
1K
Intensity of Stars and the Inverse Square Law Problem
Replies
10
Views
3K
Rotational Motion (Neutron Star)
Replies
1
Views
1K
Temperature Calculation for a Distant Star with Thermal Excitation
Replies
3
Views
1K
I How Can We Measure Properties of Distant Planets and Stars?
Replies
12
Views
2K
Main Sequence Star Mass: Star 1, 2 & 3 Comparison
Replies
5
Views
2K
How Do You Calculate the Intensity of a Star at Different Wavelengths?
Replies
1
Views
3K
Apparent vs. actual speed for moving star
Replies
3
Views
3K
Kepler's Laws, two large bodies
Replies
3
Views
1K

Hot Threads

Recent Insights

Back
Top