The lenght of the shortest wavelenght is 4.0 × 10^-7 meters. What is this number written in standard notation?​

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.