Week 5: Radiation Laws

We can use what to measure the speed of rotation of a star?

We can use what to measure the speed of stars toward or away from us according to this equation?

Who was it who predicted that light would shift colour if the observer or the source was moving relative to each other. Thus a star rushing towards us shows its hydrogen spectrum as colour shiftsed towards the what end of the spectrum?

When you have a blue star and a red star at the same distance away in space, which one would be brighter?

If we observe a star's peak colour output we can determine its surface temperature using:

If you knew the peak colour of a star, as well as its distance, it would be possible to calculate the star's "______"

It's possible to calculate a star's physical diameter using?

What is it that tells us the total energy/sec/cm^2 is a function of temperature raised to the 4th power?

If a star is twice as hot as another star, the hotter star is using its energy how much faster?

Which law is an inverse relationship such that when the temperature goes up by a factor of 10, the peak wavelength decreases by a factor of 10.

The inverse relationship where when the temperature goes up by a factor of 10, and the peak wavelength decreases by a factor of 10, means that the star gets?

Increasing the temperature of an object causes it to radiate more photons in every colour, but the peak colour moves towards which end of the spectrum?

Which law is a relationship between colour and energy/sec/cm^2 for a given temperature?

As they heat, objects begin to glow, their colour changing goes thorugh what order?

As an object heats, and begins to glow and their colours change, this is caused by what in a dense medium moving into higher orbits and them falling down to emit what?

What was observed in 1900 and which meant that physics theory did not correctly predict the energy output of a hot radiating object? It was a disaster because no one knew how to solve the problem.

Who solved the Ultraviolet Catastrophe problem by assuming energy can only be absorbed or emitted in lumps we call quanta.