Recent content by cpamieta

1. A gas that absorbs light of wavelength 500 nm in the laboratory. Suppose there is a c

Homework Statement a gas that absorbs light of wavelength 200 nm in the laboratory. Suppose there is a cold cloud of the same gas between you and a hot source of continuum (blackbody) radiation, and the cloud is moving away from Earth. You will see a spectrum with Homework Equations...
2. Need help on this differential equation

o ok thxs the wolfan alpha thing said it was when i typed it in. It also gave somthing different
3. Need help on this differential equation

i forgot how you do a differential equation, i have the solutions. I want to know how you do the dΨ/dx i thought it would just be dΨ/dx= -A/ke-kx Its been a long summer lol
4. Need help on this differential equation

Homework Statement Well this is a physics problem, need find the potential function Homework Equations \Psi =Axe-kx A and k are constants I need to find d2 \Psi/dx2 The Attempt at a Solution I thought u would just take the derivative two times but just d\Psi/dx = Ae-kx-kAxe-kx...
5. How to find distance of star using inverse square law

Homework Statement So i need to calculate the distance of some star the luminosity is 2 Lo and on earth its seen as .1 Lo Homework Equations I=L/4piR2 F=L/4piR2 The Attempt at a Solution I found two formulas, but not sure what to use. The F is flux density, and I am not sure how I...
6. How to show that the universe is static( not expanding)

nvm what i was thinking would not work
7. How to show that the universe is static( not expanding)

i know its expanding lol just think of this as different universe thats static. We have a project and one part of it is to create like a homework problem. it has to be on dark energy, so i figured my problem would be using that formula and showing the universe is static, like what Einstein thought
8. How to show that the universe is static( not expanding)

Homework Statement how can i show the universe is static and not expanding, how it really is. Homework Equations \OmegaM=... \Omega\Lambda=... The Attempt at a Solution "The expansion history of the universe depends on the amount of matter (gravity), quantified by \OmegaM...
9. I got a question about dark energy

Hey I have a project about dark energy. Part of it is that I need to make some kind of homework problem with this topic. The article talked about using 1a supernova data to see the expansion of the universe. I was I would first calculate the luminosity or whatever they did. Than using that...