How to tell if its an over or under prediction calculus?

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions