physics, true or false questions?

1. Look up Planck's Law. Classically speaking, a black body at absolute zero emits no radiation. If this is high school physics, then that is a good enough answer.

2. Consider the sun. Just because the spectrum peaks at yellow doesn't mean that there aren't longer wavelengths of light included - infrared, for example. Whether you could see the hypothetical star would depend largely on the distance, and your equipment, if any. If a star is close enough, even if it peaks in the X-ray region, we can see it - the neutron star in the crab nebula, for example.

3. Generally yes.

1. Yes.

2. Correct. I think.

3. Kind of but it's a little nuanced. Elements absorb light at particular frequencies, so what you're left with is a spectrum of light from a star with odd little black patches - these patches basically represent the elements that absorb those frequencies of light.

true excelpt according to Quantum Mechanics absolute Zero K cannot possible exist. it has been approached itching 1/1,000,000 or so K but never ZERO!

1) An object with a temperature of zero Kelvin would cease to exist, so would CERTAINLY not emit any radiation!

2) You would not be able to see it with the human eye

3) True

1. true