The distance from earth of the red supergiant betelgeuse is approximately 643 light-years. if it were to explode as a supernova, it would be one of the brightest stars in the sky. right now, the brightest star other than the sun is sirius, with a luminosity of 26lsun and a distance of 8.6 light-years. part a how much brighter in our sky than sirius would the betelgeuse supernova be if it reached a maximum luminosity of 1.1×1010 lsun? express your answer using two significant figures.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.