What's the frequency of 506 nanometers

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

The polymer used for the nonstick surface of cooking utensils is 24.0%c and 76%f by mass. what is the empirical formula of this polymer?

Type the letter that represents the correct location for each particle type below. the neutron is found at __ the electron is found at __ the proton is found at __