Engineers are testing a new thin-film coating whose index of refraction is less than that of glass. They deposit a 560-nmnm-thick layer on glass, then shine lasers on it. A red laser with a wavelength of 640 nmnm has no reflection at all, but a violet laser with a wavelength of 400 nmnm has a maximum reflection. How the coating behaves at other wavelengths is unknown.

The density of a substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational