MrToodles4
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Question 1cii please; http://pmt.physicsandmathstutor.com/...y%201%20QP.pdf

Sirius-B is a white dwarf. In comparison with Sirius-B, Antares has 12 times greater mass and has 1.1 × 10^5 times greater radius. The surface temperatures of Sirius-B and Antares are 25000K and 4300K respectively.

The intensity I of electromagnetic radiation emitted from the surface of a star is related to its temperature T in kelvin as follows:

I ∝ T^4.

Calculate the ratio:

1. mean density of Antares/ Mean density of Sirius-B. I managed this kinda with p=mv - but still don't understand the markscheme -

2. total power emitted from Antares / total power emitted from sirius-B

1cii MS http://pmt.physicsandmathstutor.com/...y%201%20MS.pdf
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