Physics Questions Exam Review 2

Laser light is a. chaotic. b. incoherent. c. coherent. d. polychromatic.

c. coherent.

The light reflected from your hand is an example of a) Fermat's principle. b) specular reflection. c) dispersion. d) diffuse reflection.

d) diffuse reflection.

Two polaroid's that have their polarization axes at 45 degrees to each other, will allow light to pass through? a. True b. False

a. True

Which of the following types of electromagnetic waves has the highest energy per photon? a) radio waves b) X-rays c) infrared radiation. d) microwaves. e) ultraviolet light.

b) X-rays

Continuous spectra are observed for a) stars. b) a hot stove. c) the helium tube. e) cool gases around stars.

b) a hot stove.

Green light emitted by excited mercury vapor corresponds to a particular energy transition in the mercury atom. A more energetic transition might emit a) red light. b) blue light. c) white light. d) yellow light.

b) blue light.

The hottest star is the star that glows a) red. b) blue. c) white. d) yellow. e) cannot be determined from color alone.

b) blue.

The shortest wavelength visible light of those below is a) red. b) blue. c) green. d) yellow

b) blue.

When a fish looks up at the surface the horizon to horizon angle is a) expanded to 196 degrees. b) compressed to 96 degrees. c) still 180 degrees. d) compressed to 90 degrees.

b) compressed to 96 degrees.

The worst thing that you can do for the health of a green-leafed plant is to illuminate it with only a) red light. b) green light. c) blue light. d) all are equally bad. e) none of these.

b) green light.

Light is emitted from atoms when an electron is a) boosted to a higher energy level. b) makes a transition to a lower energy level. c) in a circular orbit around the nucleus. d) none of these.

b) makes a transition to a lower energy level.

The colored dots that make of the colors on a TV screen or computer monitor are a) red, blue, and yellow. b) red, blue, and green. c) yellow, blue and green. d) magenta, cyan, and yellow. e) red, green and yellow.

b) red, blue, and green.

Which of the following is fundamentally different from the others? a) X-rays. b) sounds waves. c) light waves. d) radio waves. e) gamma rays.

b) sounds waves.

Refraction of light when it travels from one medium to another results from difference in light's a) frequency. b) speed. c) incident angles. d) intensity.

b) speed.

Because of atmospheric refraction the image of the sun rises _____ and sets _____ than the actual sun. a. earlier ... earlier b. earlier ... later c. later ... later d. later ... earlier

b. earlier ... later

Rainbows are due to _____. a. reflection from the surface of raindrops. b. refraction and reflection by raindrops. c. refraction through raindrops. d. refraction and reflection by ice crystals.

b. refraction and reflection by raindrops.

The energy levels of an atom are continuous because an electron can occupy any of an infinite number of orbits about the nucleus of an atom. (a) True (b) False

(b) False

The image in a plane mirror is real because you can see it with the naked eye. (a) True (b) False

(b) False

The law of reflection requires that the sum of the angle of incidence and the angle of reflection equals 90o. (a) True (b) False

(b) False

Which is hottest? (a) a red hot object (b) a blue hot object (c) a white hot object

(b) a blue hot object

What type of spectrum would you expect to obtain if white light is shined through sodium vapor? (a) an emission spectrum of sodium (b) an absorption spectrum of sodium (c) a continuous spectrum

(b) an absorption spectrum of sodium

A red filter will warm more from _________ light. (a) red (b) cyan

(b) cyan

Why can't we see stars in the middle of the day? (a) the sun is much brighter than any star (b) our atmosphere is more turbulent and the starlight is refracted away (c) scattered sunlight hides the stars from our view (d) our atmosphere totally absorbs the starlight

(c) scattered sunlight hides the stars from our view

Refraction results from differences in light's (a) frequency (b) incident angles (c) speed (d) all of these (e) none of these

(c) speed

Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is (a) considerably less (b) slightly less (c) the same (d) slightly more (e) considerably more

(c) the same

Mark the incorrect statement. (a) the cones in the human eye can sense color (b) the rods in the human eye provide our black and white vision (c) the rods in the human eye detect low intensity light better than the cones (d) the diameter of the pupil in the human eye never changes for a person of normal vision

(d) the diameter of the pupil in the human eye never changes for a person of normal vision

The sun appears slightly yellowish when viewed from the earth's surface because (a) that is its natural color (b) its surface emits more yellow light than any other color (c) the sunlight cools off as it passes through the earth's atmosphere (d) the earth's atmosphere scatters more blue light than it does red light

(d) the earth's atmosphere scatters more blue light than it does red light

Atoms of a phosphorescent material on the average stay excited longer than atoms of a fluorescent material. (a) True (b) False

(a) True

If he (she) says "I love you" and the pupils of his (her) eyes are large, then most likely he (she) means it. (a) True (b) False

(a) True

The after image of an object shows the complementary colors of the object. (a) True (b) False

(a) True

What type of spectrum would you expect to obtain if sodium is burned and analyzed by a spectroscope? (a) an emission spectra of sodium (b) an absorption spectra of sodium (c) a continuous spectrum

(a) an emission spectra of sodium

What is the resulting color of equal intensities of blue light and green light combined? (a) cyan (b) yellow (c) red (d) magenta (e) white

(a) cyan

Which color is not in the spectrum of white light? (a) magenta (b) blue (c) green (d) yellow (e) orange

(a) magenta

A beam of red light and a beam of blue light have exactly the same energy. Which beam has the greater number of photons? (a) red (b) blue (c) they both have the same number of photons

(a) red

Mixing yellow paint and magenta paint gives what color? (a) red (b) green (c) blue (d) cyan

(a) red

Magenta light is really a mixture of (a) red and blue light (b) red and cyan light (c) red and yellow light (d) yellow and green light

(a) red and blue light

An oar partially immersed in water appears "broken" because of (a) refraction (b) diffraction (c) polarization (d) interference (e) absorption

(a) refraction

Two people standing next to each other are looking at the same raindrop in a regular rainbow. One sees green from that drop and the other sees orange. Which person is taller? (a) the one who sees green (b) the one who sees orange (c) both are the same height (d) height has nothing to do with this phenomenon

(a) the one who sees green

A wire mesh screen is a diffuse reflector for which of the following frequencies? (a) visible (b) microwave (c) radio

(a) visible

You are standing on the earth viewing a total eclipse of the sun. In which shadow of the moon are you standing? (a) the penumbra (b) the umbra (c) the conundrum (d) the partial

(b) the umbra

Light will almost always travel from one place to another along a path of least (a) distance (b) time (c) effort (d) expense (e) complication

(b) time

In mirages the air next to the ground must be ______ than the air above it. (a) more reflective (b) warmer (c) cooler (d) thicker

(b) warmer

When light is behaves like a particle, we call it (a) a proton (b) a phonon (c) a photon (d) an electron (e) a wavicle

(c) a photon

What is the difference between a real image and a virtual image? (a) a real image is always erect; a virtual image can be inverted (b) a real image is always bigger than the object; a virtual image can be smaller (c) a real image can be formed on a screen; a virtual one cannot (d) there is no difference; what you get depends only on the type of mirror

(c) a real image can be formed on a screen; a virtual one cannot

If rays of light parallel to the optic axis (principal axis) are incident on ______________ a mirror, they converge to a point after leaving the mirror. (a) flat (b) convex (c) concave (d) diffuse

(c) concave

Which type of specular reflector can focus light? (a) convex shoplifting mirror (b) flat mirror (c) concave make-up mirror (d) diffuse mirror

(c) concave make-up mirror

If sunlight were green instead of white, the most comfortable color to wear on a hot day would be (a) magenta (b) yellow (c) green (d) blue (e) none of these

(c) green

A green shirt is green because (a) electrons spontaneously de-excite and radiate light in the frequency range of green (b) all except green frequencies are reflected when white light shines on the shirt (c) green light is reflected when white light shines on the shirt (d) the dyes in the shirt have phosphors

(c) green light is reflected when white light shines on the shirt

The color of an opaque object is the same as the light that (a) is transmitted (b) is absorbed (c) is reflected (d) all of these (e) none of these

(c) is reflected

What color would you expect to see if you remove the green light from white light? (a) yellow (b) cyan (c) magenta

(c) magenta

The screen in a microwave oven door that allows one to see the food inside the oven is a specular reflector for (a) visible light (b) infrared heat (c) microwaves (d) ultraviolet light

(c) microwaves

The speed of light (a) has never been measured (b) is about the same as that of sound (c) is infinitely fast (d) is very fast, but not infinite

(d) is very fast, but not infinite

The light from a laser is coherent. This means that all of the light has (a) the same phase (b) the same frequency (c) the same direction (d) all of the above (e) none of the above

(d) all of the above

Which of the following is due to refraction of light? (a) squatty body images of people standing in water (b) mirages (c) looming (d) all of the above (e) none of the above

(d) all of the above

Which color is associated with the highest frequency of visible electromagnetic waves? (a) blue (b) red (c) green (d) violet (e) magenta

(d) violet

If you wish to take a picture of your image, while standing five feet in front of a mirror for what distance, should you set your camera to to provide the sharpest focus? A. 10 ft. B. 5 ft. C. 2.5 Ft. D. can't be done

A. 10 ft.

In fluorescence which has a higher energy the radiation sword or the radiation emitted photon? A. Absorbed B. Emitted C. They both have the same

A. Absorbed

If laser light passes by hair a pattern of light and dark can be seen on a properly placed screen. What phenomenon or phenomena is or are being observed? A. Diffraction B. polarization C. Chromatic aberration D. All of the above E. None of the Above

A. Diffraction

what causes laser light to have all of its waves moving in the same direction? A. The mirrors in the laser B. the stimulated emission of atoms to radiate in the same direction C. atoms are lined up in the crystal so they emit light only in one direction

A. The mirrors in the laser

The point where a soap bubble burst will be black, just as it burst? A. True B. False

A. True

The sky is blue because air molecules in this sky act as tiny A. mirrors which reflect only blue light B. resonators would scatter blue light C. sources of white light D. Prisms E. none of the above

B. resonators would scatter blue light

what type of mirror, would you use to produce a magnified image of your face? A. a flat B. a concave C. convex D. you could use a concave or convicts

B. a concave

Polaroid sunglasses worn in a normal viewing position will eliminate _______ polarized glare? A, vertically B. horizontally C. all.

B. horizontally

What is the purpose of the pupil in an eye? A. to adjust the focal length of the lens B. to adjust the amount of light passes through the lens C. to focus the image D. to change the width of the field of view

B. to adjust the amount of light passes through the lens

a mixture of magenta and green lights give white light. These two colors are A. additive primary B. secondary colors C. complementary colors D. fluorescent colors E. interference colors.

C. complementary colors

A Lingering sunset is A. a looming effect B. caused by an elliptical (oval) sun C. due to atmospheric refraction D. caused by reflections from the upper atmosphere.

C. due to atmospheric refraction

Most of the light that we see has undergone A. selective interference B. selective transmission C. selective reflection D. selective refraction

C. selective reflection

AM band radio waves travel faster than FM band radio waves because? A. AM ways travel faster than FM waves. B. AM wavelengths are shorter than FM wavelengths. C. AM waves are scattered more than FM waves. D. AM waves are diffracted more than FM waves.

D. AM waves are diffracted more than FM waves.

What color would red cloth appear if it were illuminated by cyan light. A. cyan B. red, C. yellow D. green E. black.

E. black.

Dark lines in the Sun's spectrum represent light that is a) absorbed by the Sun's atmosphere. b) emitted by the Sun. c) not emitted by the Sun. d) in the ultraviolet region of the electromagnetic spectrum.

a) absorbed by the Sun's atmosphere.

Materials generally become warm when light is a) absorbed by them .b) reflected by them. c) transmitted by them. d) all of these.

a) absorbed by them

Some minerals absorb ultraviolet light and then release lower energy visible light. This process is called a) fluorescence. b) atomic resonance. c) incandescence. d) phosphorescence.

a) fluorescence.

If a car headlight emitted only yellow light, the normally green grass appears to be a) green. b) red. c) black. d) white. e) yellow.

a) green.

The critical angle for an air and water interface is 48 degrees. If light is incident from the water on the air, it will be totally reflected if a) if the angle of incidents is greater that 48 degrees. b) the angle of incidence is 0 degrees, straight up. c) if the angle of incidence is less that 48 degrees. d) total internal reflection is not possible in this case.

a) if the angle of incidents is greater that 48 degrees.

Mirages are mainly caused by a) refraction of light by the atmosphere. b) reflection of light from water. c) diffraction of light by air. d) dispersion of light by the atmosphere.

a) refraction of light by the atmosphere.

Green light emitted by excited mercury vapor corresponds to a particular energy transition in the mercury atom. A more energetic transition might emit _____. a. red light. b. blue light. c. either red or blue light d. white light.

b. blue light.

In the dark at late evening, no color is seen because of lack of stimulation of a. rods. b. cones. c. cornea. d. crystalline lens

b. cones.

Which of the following cannot be observed at the periphery of vision? a) movement. b) bright lights. c) color. d) shapes.

c) color.

Suppose that two flashlight beams are shone on a white screen, one through a pane of blue glass and the other through a pane of green glass. What color appears on the screen where the two beams overlap? a) yellow b) green c) cyan d) magenta e) red

c) cyan

To see an after image of a red, white and blue Texas flag one would first stare at a flag with the complimentary colors a) yellow, violet, and green. b) cyan, yellow, and magenta. c) cyan, black, and yellow. d) yellow, cyan and green.

c) cyan, black, and yellow.

A beam of light passing through a prism has its colors spread out. The phenomenon is know as a) reflection. b) refraction. c) dispersion. d) diffraction.

c) dispersion.

Discrete spectral lines occur when excitation takes place in a a) solid. b) liquid. c) gas. d) superconductor. e) all of these.

c) gas.

As you move forward toward a rainbow, the apparent height of the rainbow a) increases. b) decreases. c) stays the same.

c) stays the same.

Different colors of light correspond to different light a) speeds. b) intensities. c) wavelengths. d) polarities.

c) wavelengths.

For the drawing below which ray is most likely red? (a) 1 (b) 2 (c) 3

c. 3

Look at a full-color picture in a magazine with a magnifying glass and you'll see that the colored inks used are a) red, blue, and yellow. b) red, blue, and green. c) yellow, blue and green. d) magenta, cyan, and yellow. e) red, green and yellow.

d) magenta, cyan, and yellow.

Some paints glow in the dark after the lights are turned off. This is because of a) fluorescence. b) resonance. c) incandescence. d) phosphorescence.

d) phosphorescence.

A photographer wishes to use a safety light in the darkroom that will emit low energy photons. The best visible color to use is a) violet. b) blue. c) green. d) red. e) any of these.

d) red.