The half-life of hydrogen-3 (tritium) is approximately 12 years. in how many years will half of a 20-gram sample decay by beta radiation to helium-3? 6 12 10 20

On a distance vs time graph the line of an object at rest is a

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

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons