12. Why can two stars have the same color but have different luminosities?

a. One star has a higher surface temperature

b. One star is a much larger size

10. The star with the lowest luminosity is dimmest because of its surface temperature or size?
a. Surface temperature
b. Size

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x 

Phagocytes contain digestive enzymes to facilitate the process of phagocytosis

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.