Assignment 6 - Topic 24& 25

1. In two separate double slit experiments, an interference pattern is observed on a screen. In the first experiment, violet light ( = 754 nm) is used, and a second-order bright fringe occurs at the same location as a third-order dark fringe in the second experiment. Determine the wavelength of the light used in the second experiment. 2. A Michelson interferometer is used to measure the wavelength of light emitted from a monochromatic source. As the adjustable mirror is slowly moved through a distance DA = 0.0265 mm, an observer counts 411 alternations between bright and dark fields. What is the wavelength of the monochromatic light used in this experiment? 3. Light of 600.0 nm is incident on a single slit of width 6.5 m. The resulting diffraction pattern is observed on a nearby screen and has a central maximum of width 3.5 m. What is the distance between the screen and the slit?

4. Complete the following sentence: The various colors of visible light differ in

a. frequency only.

b. wavelength only.

c. their speeds in a vacuum.

d. frequency and wavelength.

e. frequency and their speed in a vacuum.

5.A cellular telephone transmits electromagnetic waves at a frequency of 935 MHz. What is the wavelength of these waves?

6. The most convincing evidence that electromagnetic waves are transverse waves is that

a. they can be polarized.

b. they carry energy through space.

c. they can travel through a material substance.

d. they do not require a physical medium for propagation.

e. all electromagnetic waves travel with the same speed through vacuum.

7. Unpolarized light with an average intensity of 750.0 W/m² enters a polarizer with a vertical transmission axis. The transmitted light then enters a second polarizer. The light that exits the second polarizer is found to have an average intensity of 125 W/m². What is the orientation angle of the second polarizer relative to the first one? Note that the intensity of unpolarized light is halved when passing through a polarizer.