1a. You purchase a cooler from a sneaky alien salesman. You are uncertain of wha

Question

1a. You purchase a cooler from a sneaky alien salesman. You are uncertain of what alien material it is made of so you decide to test how well it acts as an insulator. You place 2kg of ice into the cooler and it takes 30 minutes to melt. The surface area of the cooler is 0.75m^2 and the thickness of the sides is 3cm. The temperature inside of the cooler is 2 degrees celcius and the temperature outside of the cooler is 25 degrees celcius. What is the thermal conductivity of the material the cooler is made out of?

1b. Star 1 emits energy at a rate that is 2 time that of Star 2. If Star 1 is 3 time larger than Star 2. How do the temperatures of the star compare?

Explanation / Answer

At the point when warm is added to a protest, its temperature increments. The adjustment in the temperature is corresponding to the measure of warmth included

The consistent C is known as the warmth limit of the question. The warmth limit of a protest relies upon its mass and the kind of material of which it is made. The warmth limit of a protest is relative to its mass, and the warmth limit per unit mass, c, is ordinarily utilized. All things considered

where m is the mass of the question. The molar warmth limit is the warmth limit per mole of material. For most materials the molar warmth limit is 25 J/mol K.

Keeping in mind the end goal to decide the warmth limit of a substance we not just need to know how much warmth is included, yet in addition the conditions under which the warmth exchange occurred. For gasses, including heat under steady weight and under consistent temperature will prompt altogether different estimations of the particular warmth limit.

Consider the ingestion lines caused when a gas of Hydrogen particles assimilates photons with a vitality that relates to an electron bouncing from the first energized state to the second energized state in the H iota. This photon has a wavelength of 636.5 nm (recall? Halpha ).

For this to happen, there must be some H iotas in the gas with their electrons in the first energized state.

Assume we are discussing the air of a star.

For stars with LOW surface temperatures, the iotas and atoms in the air are by and large not flying around as quick as in a more sultry gas. This implies:

There will be less energtic impact between molecules that could thump electrons into energized states and

basically all the H iotas have their electrons in the ground state so regardless of whether there are numerous H molecules, there will be no obvious assimilations at 636.5nm.

For stars with HIGH surface temperature, the molecules in the environment are flying around rapidly.

Presently there are numerous fiery impacts however

a huge portion of the H iotas are ionized with no possibility of delivering ingestion lines.

Or, on the other hand, for stars with simply the correct surface temperature to such an extent that impacts persistently populate the first energized state with electrons, there will be LOTS of photons got that knock the electrons to the second energized level and there will be solid H-assimilation lines.

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