Levi observed properties of four different waves and
recorded observations about each one in his chart.
which statement is best supported by the table?
wave
observations
travels fastest
through metal
travels fastest
through air
travels more slowly
through water than
air
travels more slowly
at cool temperatures
wave w and y are light waves, wave z is a sound
waves, and it is impossible to tell what kind of wave
wave x is.
wave w is a light wave, waves x and y are sound
waves, and it is impossible to tell what kind of wave
wave zis.
waves w and z are sound waves, and waves x and y
are light waves
wave w is a sound wave, waves x and y are light
waves, and it is impossible to tell what kind of wave
wave zis

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

How much force was applied to an object if was moved 2 meters and the work done on the object was 8 joules? a. 0.25 n b. 4 n c. 6 n d. 16 n

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0