Jillian then applies 1 mL of four different types of antibiotic to the different plates. The plates are incubated in the dark at the same temperature and humidity for one week. Jillian records the number of colonies that remain on each plate at the end of each day during the week. Her results appear below. Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7
Plate 1 100 90 80 70 60 50 40
Plate 2 100 87 69 55 43 43 43
Plate 3 100 95 110 125 150 138 104
Plate 4 100 50 37 16 0 0 0

What is the outcome variable (dependent variable) in Jillian's experiment?
A.
the type of antibiotic that is used
B.
the type of bacteria that is being tested
C.
the number of bacterial colonies that remain
D.
the initial number of bacterial colonies

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.