What is the od of your culture if the spectrophotometer is reading 0.200 on a sample diluted 1: 5?

a time line cause it goes from 685 to 978

the denominator has a very specific role.

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.