Who am I? my number name has the same number of letters as me. I am number ​

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

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal