A student did an experiment to see how much candy she should use to make rock candy. She made one solution that had 3 parts sugar to one part water (3:1), and another solution that had one part sugar to one part water (1:1). She measured how many grams of candy was formed. The results are on the chart below What were the variables that the student need to control in this investigation? (check all that apply)
A. the temperature in the room
B. how hot the water was that she used
C. how much food coloring she used
D. the amount of sugar used

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?