I have to send them to my teacher and I need the solutions!!!

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Define a is a tiny pavket of energy