Chapter 29: Light Waves

The type of radio waves that is diffracted the most around small buildings are: a.) AM b.) FM c.) both diffract equally

a.) AM

When you view a soap film by white light coming from almost behind you head, you see a certain color. A friend of the other side of the film likely sees: a.) a different color b.) the same color

a.) a different color

Because of absorption, a Polaroid will actually transmit 40% of incident unpolarized light. Two such Polaroids with their axes aligned will transmit: a.) between 0% and 40% b.) 40% c.) 0% d.) between 40% and 100%

a.) between 0% and 40%

For radio reception, diffraction is: a.) helpful b.) not a factor c.) a hinderance

a.) helpful

For viewing tiny objects in a microscope, diffraction is a: a.) hindrance b.) not a factor c.) helpful

a.) hindrance

The results of superposing different waves is called: a.) interference b.) diffraction c.) refraction d.) polarized light

a.) interference

Light will not pass through a pair of Polaroids when their axes are: a.) perpendicular b.) 45 degrees to each other c.) parallel d.) all of these

a.) perpendicular

Camera lenses coated with a layer of transparent material of the right thickness are almost completely non-reflective for light near the middle of the visible spectrum. They do, however, reflect a significant amount of: a.) red and violet b.) red c.) violet d.) green

a.) red and violet

Interference effects are less visible for thick films because the reflected waves: a.) become too dispersed b.) are too displaced to intervene c.) all end up in phase with each other d.) from the bottom surface are too dim

b.) are too displaced to intervene

The spacings between double-slit interference fringes is increased if the slits are: a.) narrower b.) closer together c.) wider d.) farther apart

b.) closer together

The bending of light that pass around an obstacle or through a narrow slit, causing the light to spread is called: a.) refraction b.) diffraction c.) interference d.) Polarization

b.) diffraction

Magnification can be accomplished with a hologram when viewed with a light that has a: a.) shorter wavelength than the original light b.) longer wavelength than the original light c.) holograms cannot be magnified

b.) longer wavelength that the original light

Consider the interference colors seen in a film of gasoline on a wet street. The function of the water is to provide a: a.) means of slowing the rapid evaporation of gasoline b.) second reflecting surface c.) means of spreading the gasoline into a thin film d.) all of these

b.) second reflecting surface

Polarization is a property of: a.) longitudinal waves b.) transverse waves c.) both d.) neither

b.) transverse waves

The colors of a soap bubble is caused by the interference between: a.) incident and reflected rays b.) two reflected rays from top and bottom surfaces c.) refracted rays from top and bottom surfaces

b.) two reflected rays from top and bottom surfaces

An ideal Polaroid will transmit 50% of unpolarized light incident on it. How much light is transmitted by two ideal Polaroids that are oriented with their axis parallel to each other? a.) 0% b.) between 0% and 50% c.) 50% d.) between 50% and 100%

c.) 50%

Some double-pane airplane windows darken when the inner pane is rotated. The panes are: a.) optical fibers b.) thin films c.) Polaroid filters

c.) Polaroid filters

The vibrational direction of the electron and the plane of polarization of the light it emits: a.) may or may not be at right angles to each other b.) are at right angles to each other c.) are the same d.) are independent of each other

c.) are the same

The polarization axes of glasses for 3-D viewing are: a.) horizontal b.) vertical c.) at right angles to each other

c.) at right angles to each other

A thin film appears yellow when illuminated with white light. The color being called by destructive appearance is: a.) green b.) red c.) blue d.) cyan

c.) blue

Holograms employ the principle of: a.) interference b.) diffraction c.) both of these d.) neither of these

c.) both of these

A hologram is simply a: a.) thin sheet of non-cubic transparent crystals b.) pair of semi-crossed polarization filters c.) complex diffraction grating d.) none of these

c.) complex diffraction grating

Diffraction is the result of: a.) reflection b.) refraction c.) interference d.) polarization

c.) interference

The spacing of Newton's rings will be greater with: a.) blue light b.) white light c.) red light

c.) red light

To perceive greater detail a dolphin emits sounds of: a.) greater intensity b.) low frequency c.) shortest wavelength d.) long period

c.) shortest wavelength

Diffraction will occur if the wavelength of light is: a.) longer than the opening b.) shorter than the opening c.) the same for each

c.) the same for each

The polarization axis of polarized sunglasses is: a.) unpolarized b.) horizontal c.) vertical

c.) vertical

Every point on a wave front acting as a source of new waves is: a.) Fourier analysis b.) interference c.) Fermat's Principle d.) Huygen's Principle

d.) Huygen's Principle

Sun light is: a.) mixed frequency light b.) unpolarized light c.) traverse light d.) all of the above

d.) all of the above

The reflected light from the surface of snow is: a.) polarized light b.) horizontally polarized c.) electric field parallel to the surface d.) all of these

d.) all of these

Those bright Newton's rings are: a.) diffractions b.) dispersions c.) refraction d.) constructive interference

d.) constructive interference

A two dimensional microscopic interference pattern that shows 3-D optical image is called: a.) virtual b.) polarization c.) interference d.) hologram

d.) hologram

An inventor proposes to equip an office with a polarized source of background music and let those who prefer not to hear it wear polarizing earplugs. His idea is: a.) a good one-giving people a choice b.) too much bother c.) too expensive d.) nonsense- you can't polarize a sound wave

d.) nonsense- you can't polarize a sound wave

The light with fixed direction of vibrating electric field is: a.) diffraction b.) interference c.) refraction d.) polarized light

d.) polarized light

The function of polarizing filters in viewing 3-D slides or movies is to provide each eye: a.) with light polarized at right angles to each other b.) a balanced intensity c.) the ability to see parallax d.) a stereoscopic view e.) an independent left or right-hand view

e.) an independent left or right-hand view