Assume a stellar atmosphere of pure helium. (a) find at t-15,000k. assume the electron pressure in the atmosphere is p 20 n /m2. calculate how this would change for t 5,000k and t 25,000 k. helium has two electrons and so can be doubly ionized, he ii. (b) what is nat t15,000k. caleulate how this would change for t= 5,000k and t 25,000 k. (c) how does compare to as the temperature changes? describe why this occurs.

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kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.