Answer to Question 1
b
Answer to Question 2
To understand the mass-luminosity relation, recall (1) the principle of hydrostatic equilibrium, which says that pressure balances weight, and (2) the pressure-temperature thermostat, which regulates energy production. A star that is more massive than the Sun has more weight pressing down on its interior, so the interior must have a higher pressure to balance that weight. That means the massive star's automatic pressure-temperature thermostat must keep the gas in its interior hot and the pressure high. A star less massive than the Sun has less weight on its interior and thus needs less internal pressure; therefore, its pressure-temperature thermostat is set lower. Massive stars are more luminous because they must make more energy to support their weight.
Approach used to determine the evolutionary relationships among many animal species using molecular
Local and long–distance cell communication in animals.
Grace Service, a YMCA missionary, explained that these porters worked at the base of Mount Omei in S
Alternative methods for locating the CPT Main Term.
Methods for Parenteral Administration of Drugs
How to determine the commission of a sale