PHYS175 Final Multiple Choice

A spread of colors is called a spectrum

True

If the frequency of a particular wave is 20 Hz, its period is _________ .

0.05s

A train whistles with a frequency of 800 Hz while moving toward a station. What frequency is heard by someone on the train and someone at the station? A) Both hear 800 Hz B) 800 Hz and 900 Hz, respectively C) 800 Hz and 700 Hz, respectively D) Both hear 700 Hz E) 700 Hz and 800 Hz, respectively F) 900 Hz and 700 Hz, respectively

B) 800 Hz and 900 Hz, respectively

The scientific method is most effective in A) making hypotheses. B) gaining, organizing, and applying new knowledge. C) making theories. D) performing experiments. E) none of the above

B) gaining, organizing, and applying new knowledge.

What color paint do you get when you mix red and cyan paint?

BLACK

A 40 kg block is resting at a height of 5.0 m off the ground. If the block is released from rest and falls to the ground, what is the total energy at a height of 1.0 m? A) 200 J B) 392 J C) 784 J D) 1,960 J

D) 1,960 J

An opaque object is the color it absorbs

False

An opaque object is the color of the light that shines on it

False

An opaque object is the color of white light

False

Human vision is most sensitive to colors in the red-orange part of the visible spectrum

False

The brightest portion of the spectrum of sunlight is violet

False

If one photon in a beam of yellow light carries an energy of x, and a second photon has a higher energy than the first, indicate the possible beam colors in which the second photon may be found. red orange green blue violet

Green Blue Violet

Which of the following are considered to be primary subtractive colors of opaque surfaces? red magenta orange yellow green cyan blue violet black white

Magenta Yellow Cyan

Which of the following are considered to be primary additive colors of light? red magenta orange yellow green blue cyan violet black white

Red Green Blue

A transparent object is the color of the light it transmits

True

A white object appears when illuminated by white light

True

An opaque object is the color it reflects

True

Black is not actually a color

True

Sunlight is a combination of all colors

True

White is not actually a color.

True

A jet traveling at faster than the speed of sound passes overhead. The sonic boom produced is heard by a) a listener on the ground b) the jet pilot c) both of these d) neither of these

a) a listener on the ground

Why does transparent, green glass appear green when white light is shone through it? a) It absorbs all colors except green light, which it transmits. b) It absorbs green light, and trasmits all other colors. c) It absorbs and transmits all colors of light, the material making the glass is just green. d) It reflects green light, and transmits all other colors.

a) It absorbs all colors except green light, which it transmits.

Does a single raindrop illuminated by sunlight deflect light of a single color or does it disperse a spectrum of colors? Does it do this by reflection, refraction, or both? Select all that apply. a) It disperses a spectrum of colors. b) It deflects a single color. c) By both reflection and refraction d) Only by reflection. e) Only by refraction.

a) It disperses a spectrum of colors. c) By both reflection and refraction

Distinguish between these different aspects of a wave: period, amplitude, wavelength, and frequency. a) Period is the time from one crest to the next, amplitude is the distance from the midpoint to a crest, wavelength is the distance from one crest to the next, and frequency is the number of crests that pass per second. b) Period is the time from one crest to the next, amplitude is the distance from one crest to the next, wavelength is the distance from the midpoint to a crest, and frequency is the number of crests that pass per second. c) Period is the distance from one crest to the next, amplitude is the distance from the midpoint to a crest, wavelength is the time from one crest to the next, and frequency is the number of crests that pass per second. d) Period is the number of crests that pass per second, amplitude is the distance from the midpoint to a crest, wavelength is the distance from one crest to the next, and frequency is the time from one crest to the next.

a) Period is the time from one crest to the next, amplitude is the distance from the midpoint to a crest, wavelength is the distance from one crest to the next, and frequency is the number of crests that pass per second.

Why is ultraviolet light, but not infrared light, effective in making certain materials fluoresce? a) The ultraviolet light photons have higher energy than visible light photons, whereas the infrared have lower energy. Thus, some of the ultraviolet energy can be reemitted as visible color. b) Ultraviolet light is brighter than infrared, so ultraviolet light can excite more fluorescence. c) The ultraviolet light photons have lower energy than visible light photons, whereas the infrared have higher energy. Thus, several of the ultraviolet photons can add energy, which can be reemitted as visible color. d) Ultraviolet light is more polarized than infrared, so ultraviolet light can excite more fluorescence.

a) The ultraviolet light photons have higher energy than visible light photons, whereas the infrared have lower energy. Thus, some of the ultraviolet energy can be reemitted as visible color.

Excitation is the process in which a) electrons are boosted to higher energy levels in an atom. b) atoms are charged with light energy. c) atoms are made to shake, rattle, and roll. d) None of the above.

a) electrons are boosted to higher energy levels in an atom.

There are a couple of equations that relate wavelength and frequency of a light wave and that relate the frequency and energy of light (photon) λf=c, where λ is wavelength and f is frequency and c = speed of light, which is a constant. That means that wavelength is inversely proportional to frequency. Energy E=hf, where h is a constant (known as Planck's constant) and f is frequency. That means that Energy is directly proportional to frequency. Use these two facts to identify the correct statement about light below. The higher the photon energy .... a) the higher the frequency and the shorter the wavelength. b) the higher the frequency and the longer the wavelength. c) the lower the frequency and the shorter the wavelength. d) the lower the frequency and the longer the wavelength.

a) the higher the frequency and the shorter the wavelength.

Compressions and rarefactions normally travel in a) the same direction in a wave. b) opposite directions in a wave. c) right angles to the wave direction. d) none of the above

a) the same direction in a wave.

The source of every sound is produced by something that is a) vibrating. b) accelerating. c) undergoing simple harmonic motion. d) a net emitter of energy.

a) vibrating.

A ray directed at a glass-air interface undergoes total internal reflection at the critical angle. Suppose a layer of water is poured on top of the glass. (Water has an index of refraction between that of glass and air.) Which of the following happens? a) The ray is still totally internally reflected at the glass interface. b) The ray is now totally internally reflected at the water-air interface. c) The ray is no longer totally internally reflected anywhere. d) The answer depends on the angle of incidence on the glass-water interface.

b) The ray is now totally internally reflected at the water-air interface.

A particle (or quantum) of light is called a a) proton. b) photon. c) phonon. d) None of the above.

b) photon.

When an object is set vibrating by a wave having a frequency that matches the natural frequency of the object, what occurs is a) forced vibration. b) resonance. c) refraction. d) amplitude enhancement.

b) resonance.

What color light is produced when light from two complementary colors, like yellow and blue, are added together? a) black b) white c) green d) cyan

b) white

A wave with wavelength 10 m and time between crests of 0.5 s is traveling in water. What is the wave speed? a) 5 m/s b) 10 m/s c) 20 m/s d) 40 m/s

c) 20 m/s

Two identical golf carts move at different speeds. The faster cart has three times the speed and therefore has ___ the kinetic energy a) 3 times b) 4 times c) 9 times

c) 9 times

In the Doppler effect, does frequency change? Does wave speed change? a) Both speed and frequency change. b) Neither speed nor frequency change. c) Only frequency changes. d) Only speed changes.

c) Only frequency changes.

If molecules in the sky scattered low-frequency light more than high-frequency light, what color would the sky be at noon? a) blue b) violet c) red d) green e) white

c) Red

Light normally travels in straight lines, but it "bends" in an optical fiber. Explain. a) The interior of the optical fiber is made with high dispersion and light always bends toward higher dispersion. b) The interior of the optical fiber has lower density glass and light always bends toward lower density. c) Total internal reflection keeps the light trapped inside the optical fiber. d) The optical fiber is coated with an aluminized metal mirror that reflects the light and keeps it inside the fiber.

c) Total internal reflection keeps the light trapped inside the optical fiber.

What is the relationship among frequency, wavelength, and wave speed? a) Wave speed is the square root of frequency multiplied by wavelength. b) Wave speed is the square root of frequency divided by wavelength. c) Wave speed is frequency multiplied by wavelength. d) Wave speed is frequency divided by wavelength.

c) Wave speed is frequency multiplied by wavelength.

Each of the spectral lines seen in the eyepiece of a spectroscope is due to a) differences in temperature between various atomic energy levels. b) photons cascading between energy levels in atoms. c) electrons making transitions from one energy level to another. d) the combination of light frequencies emitted by excitation.

c) electrons making transitions from one energy level to another.

A high-frequency sound source produces a high a) speed b) amplitude c) pitch d) all of the above

c) pitch

The smallest portion of the electromagnetic spectrum is _________. a) radio b) infrared c) visible light d) none in particular as all make up equal portions of the spectrum

c) visible light

What color of light is created if you were to converge beams of red, green, and blue light? a) brown b) black c) white d) grey e) purple

c) white

If two waves are completely in phase, what is the amplitude of the resultant wave if the amplitudes of the original waves are 5.0 cm and 3.0 cm? A) 2.0 cm B) 3.0 cm C) 5.0 cm D) 8.0 cm

d) 8.0 cm

As the block slides down a ramp, what happens to its kinetic energy KE, potential energy PE, and total mechanical energy E? a) KE decreases; PE increases; E stays the same b) KE decreases; PE increases; E increases c) KE increases; PE increases; E increases d) KE increases; PE decreases; E stays the same

d) KE increases; PE decreases; E stays the same

When you tap various objects, they produce characteristic sounds that are related to A) wavelength. B) amplitude. C) period D) natural frequency. E) refraction. F) reflection

d) Natural frequency

What can the human eye see? a) Infrared radiation b) Ultraviolet radiation c) Both A and B. d) Neither A nor B.

d) Neither A nor B

Science is a body of knowledge that a) describes order in nature. b) is an ongoing human activity. c) condenses knowledge into testable laws. d) all of the above.

d) all of the above

When the frequency of a photon is doubled, the energy it carries _________. a) halves b) may be any value c) remains the same d) doubles

d) doubles

High-pitched sound has a high a) speed. b) rate of vibration. c) both of these d) neither of these

d) neither of these

Reports are that singer Caruso was able to shatter a crystal chandelier with his voice, which illustrates A) an echo B) refraction C) beats D resonance E) interference F) amplitude

d) resonance

The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world is known as a scientific A) fact. B) hypothesis. c) law or principle. d) theory.

d) theory

The fastest light inside clear glass is red. green. blue. no color in particular, for light of all colors travels at the same speed.

red