The solar radius is the distance between the core and the outer edge of a star. Betelgeuse, Rigel, and Polaris all have large solar radii. Sirius B, Epsilon Eridani and Barnard’s Star all have small solar radii. What is the relationship between the solar radius and the brightness of stars?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.