What does the ring look like?

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

An observation that requires measurement is called quantitative observable or qualitative

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays