Assume a stellar atmosphere of pure helium. (a) find i at t=15,000k. assume ni the electron pressure in the atmosphere is pe 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 iii. (b) what is nat t-15,00ok. calculate how this would change for t = 5,000k and t 25,000 k. (c) how does l compare to as the temperature changes? describe why this occurs ni

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Calculate the minimum energy required to remove one proton from the nucleus 126c. this is called the proton-removal energy. (hint: find the difference between the mass of a 126c nucleus and the mass of a proton plus the mass of the nucleus formed when a proton is removed from 126c.) express your answer with the appropriate units. emin e m i n = nothing nothing request answer part b how does the proton-removal energy for 126c compare to the binding energy per nucleon for 126c, calculated using eb=(zmh+nmn−azm)c2?

5m/swhenhereaches and even steeper slope. if he accelerates at 2 m/s2 for the 5 m slope, how fast is he traveling when he reaches the bottom of the 5 m slope?