Determine the mass of 8.59 ×1023 atoms cl. answer in units of g.

What is the density of the black hole

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line