Which of the following would have to happen in order for an electron in energy level 3 to move to energy level 4

Which is mostly likely why many scientists reject the cold fusion theory

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

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