Explain why we observe multiple bright bands of light on a screen after light of a particular wavelength passes through two narrow, closely spaced slits.

A double-slit interference pattern is created by two narrow slits spaced 0.25 mm apart. The distance between the first and the fifth minimum on a screen 60 cm behind the slits is 5.5 m m. What is the wavelength (in nm) of the light used in this experiment?

An electric current is induced in a conducting loop by all but one of these processes. Which one does not produce an induced current? (a) rotating the loop so that it cuts across magnetic field lines. (b) placing the loop so that its area is perpendicular to a changing magnetic field. (c) moving the loop parallel to uniform magnetic field lines. (d) expanding the area of the loop while it is perpendicular to a uniform magnetic field

If you are standing at Earth’s magnetic north pole and holding a bar magnet that is free to rotate in three dimensions, which direction will the south pole of the magnet point? A. straight up, B. straight down, C. parallel to the ground, toward the north, D. parallel to the ground, toward the south.

How are electric motors and generators similar? How are they different?

The refractive index of Crown glass is about 1.51 for a yellow color. What does this number tell us about the speed of light in glass? What does it tell us about the frequency of the light? Its wavelength?