Physics test 1 Dr. Bryan

The critical angle for a given substance is 32.6°. What is this material's index of refraction? 1.86 1.32 1.47 1.97

1.86

What is the speed of light through a material that has an index of refraction equal to 1.26? 2.12 x 108 m/s 1.57 x 108 m/s 1.32 x 108 m/s 2.38 x 108 m/s

2.38 x 108 m/s

When radium (Z = 88) emits an alpha particle, the resulting nucleus has atomic number ____________. 88 92 86 90

86

When thorium (Z = 90) emits a beta minus particle (electron), the resulting nucleus has atomic number _____ . 90 88 89 91

91

What is the daughter nucleus if Po-212 undergoes electron decay? Answers: Bi-212 Po-211 At-212 Bi-210 Bi-213 At-213

At-212

What is the daughter nucleus if Po-212 undergoes proton decay? At-212 Bi-212 Po-211 Bi-210 Bi-211 At-213

Bi-211

What is the daughter nucleus if Fe-58 undergoes electron decay? Fe-59 Mn-59 Mn-57 Fe-57 Co-58 Mn-58

Co-58

Which radiation has no electric charge associated with it? alpha beta gamma all of these none of these

Gamma

Which principle is used to explain diffraction of a wave? Huygens Principle Newton's Principle The Polarization Principle The Diffraction Principle The Wave Uncertainty Principle

Huygens Principle

What is the daughter nucleus if Au-198 undergoes alpha decay? Au-194 Tl-194 Ir-194 Tl-198 Ir-198 Ir-202

Ir-194

For a given time period, 80% of the nuclei in a radioactive source are expected to decay. The equation for the number undecayed at any time t is given by... N(t) = N0(5/4)t N(t) = N0(5/1)t N(t) = N0(1/5)t N(t) = N0(4/5)t

N(t) = N0(1/5)t

For a given time period, 20% of the nuclei in a radioactive source are expected to decay. The equation for the number undecayed at any time t is given by... N(t) = N0(4/5)t N(t) = N0(5/4)t N(t) = N0(1/5)t N(t) = N0(5/1)t

N(t) = N0(4/5)t

What is the daughter nucleus if Os-188 undergoes neutron decay? Ir-187 Ir-188 Re-187 Os-187

Os-187

What is the daughter nucleus if Po-212 undergoes gamma decay? Bi-210 Po-212 Bi-211 Bi-212 Po-211 At-212

Po-212

What is the daughter nucleus if Ru-103 undergoes proton decay? Ru-102 Tc-103 Tc-104 Rh-102 Tc-102 Rh-103

Tc-102

Under what circumstance will the image formed by a converging lens will be virtual and reduced? When the object is greater than two focal lengths away from the lens. When the object is inside the focal point. When the object is greater than one focal length away from the lens. The image formed by a converging lens is never virtual and reduced. When the object is two focal lengths away from the lens. When the object is on the focal point. When the object is between one and two focal lengths from the lens.

The image formed by a converging lens is never virtual and reduced.

What is the daughter nucleus if Os-188 undergoes alpha decay? W-188 Pt-184 W-192 W-184 Os-184 Pt-192

W-184

Under what circumstance will the image formed by a converging lens will be real and reduced? When the object is two focal lengths away from the lens. When the object is greater than one focal length away from the lens. When the object is greater than two focal lengths away from the lens. When the object is between one and two focal lengths from the lens. When the object is inside the focal point. When the object is on the focal point. The image formed by a converging lens is never real and reduced.

When the object is greater than two focal lengths away from the lens.

Which will warm up quicker in sunlight? a piece of colored glass a piece of clear glass both the same

a piece of colored glass

A nucleon is either... : a proton or an electron. a neutron or an electron. a proton or a neutron. a proton, neutron, or electron.

a proton or a neutron.

A beam of light travels fastest in glass. water. plastic. air. is the same in each of these

air

Which color of light has the greatest speed in a vacuum? red orange yellow green blue violet all have the same speed in a vacuum

all have the same speed in a vacuum

Interference is a property of light waves. sound waves. water waves. all of these none of these

all of these

The half-life of a radioactive substance is INDEPENDENT of... the number (if large enough) of atoms in the substance. whether the substance exists in an elementary state or in a compound. the temperature of the substance. the age of the substance. all of these.

all of these.

Images formed by diverging lenses are _____________ upright. always sometimes never

always

mages formed by diverging lenses are _____________ reduced. always sometimes never

always

An atom with an imbalance of electrons to protons is ... a baryon. a hadron. an isotope. an ion.

an ion.

Interference patterns can result when light passes through .... single slits only. double slits only. only single and double slits. any number of slits.

any number of slits.

According to Huygens' principle, every point on a wave is a diffraction source. behaves as a source of new waves. is the superposition of every other part of the wave. all of these none of these

behaves as a source of new waves.

What color is a normally magenta object when illuminated with green light?

black

What color is a normally red object when illuminated with blue light? white cyan magenta green black yellow blue red

black

What color is a normally blue object when illuminated with cyan light? green black red blue cyan white yellow magenta

blue

What color is a normally magenta object when illuminated with blue light? red blue green cyan yellow magenta white black

blue

When a beta plus particle (positron) is ejected from a nucleus, the nucleus then has appreciably less ... mass. charge. both of these neither of these

charge

When a beta minus particle (electron) is ejected from a nucleus, the nucleus then has appreciably greater ... mass. charge. both of these neither of these

charge.

Cellophane tape can be used to produce polarized light that is..... ultraviolet. infrared. colorful. diffused.

colorful.

A "burning glass" used to concentrate sunlight in a tiny spot is a converging lens. diverging lens. either neither

converging lens.

Convex lenses are also known as converging lenses. gravity lenses diverging lenses. contact lenses.

converging lenses.

As the index of refraction of a lens increases, its focal length.... increases. decreases. remains unchanged. all of the above are possible

decreases

As the radius of curvature of a lens decreases, its focal length.... increases. decreases. remains unchanged. all of the above are possible

decreases

When considering single slit interference, the pattern spreads out as the slit width __________ . none of these increases decreases remains constant

decreases

When a nucleus emits a proton, its atomic number .... decreases by 1. doesn't change. increases by 1. decreases by 2.

decreases by 1.

When considering double slit interference, the distance between bright spots is _____________________ the wavelength of light. directly proportional to inversely proportional to unrelated to equal to

directly proportional to

The type of lens that spreads parallel light is a combination converging-diverging lens. converging lens. diverging lens.

diverging lens.

Concave lenses are also known as contact lenses. diverging lenses. gravity lenses converging lenses.

diverging lenses.

When a nucleus emits a positron, its atomic mass .... decreases by 1. decreases by 2. doesn't change. increases by 1.

doesn't change.

An opaque object is yellow when illuminated with white light. What color is it when viewed through a cyan transparency? green magenta cyan yellow black red blue

green

What color is a normally yellow object when illuminated with green light? white cyan green magenta yellow red blue black

green

Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in the clear glass. green glass. Neither it will be the same in each.

green glass.

The glare seen from water is largely... vertically polarized. circular polarized. horizontally polarized. unpolarized.

horizontally polarized.

As the radius of curvature of a lens increases, its focal length....

increases

When considering double slit interference, the pattern spreads out as the wavelength __________ . increases none of these remains constant decreases

increases

When a nucleus emits a beta minus particle (electron), its atomic number .... decreases by 1. doesn't change. increases by 1. decreases by 2.

increases by 1.

When considering double slit interference, the distance between bright spots is _____________________ the distance between slits. inversely proportional to equal to directly proportional to unrelated to

inversely proportional to

Waves diffract the most when their wavelength is short. long. inverted. Both diffract the same.

long.

The complementary color of green is magenta. red. blue. cyan. yellow.

magenta

What color light is transmitted by a piece of magenta glass? red blue green yellow cyan magenta

magenta

If sunlight were green instead of white, the most comfortable color to wear on a cold day would be magenta. yellow. green. blue. violet.

magenta.

Light that consists of only one color is known as ___________ . polarized polychromatic diffracted monochromatic iridescent

monochromatic

At night an underwater scuba diver aims his flashlight beam toward the surface at an angle of 15 degrees with the normal. Upon emerging, the beam angle will be... impossible to predict. 15 degrees. more than 15 degrees. less than 15 degrees.

more than 15 degrees

When a gamma ray is ejected from a nucleus, the nucleus then has appreciably less ... mass. charge. both of these neither of these

neither of these

Images formed by diverging lenses are _____________ enlarged.

never

Images formed by diverging lenses are _____________ inverted. always sometimes never

never

Images formed by diverging lenses are _____________ real. always sometimes never

never

Images formed by diverging lenses are _____________ the same size as the object. always sometimes never

never

mages formed by diverging lenses are _____________ inverted. always sometimes never

never

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... nonsense - you can't polarize a sound wave. a good one - giving people a choice. too expensive. too much bother.

nonsense - you can't polarize a sound wave.

Light will not pass through a pair of Polaroids when their axes are... Selected Answer: perpendicular. Answers: parallel. perpendicular. 45 degrees to each other. all of these. Light will not pass through a pair of Polaroids when their axes are... parallel. perpendicular. 45 degrees to each other. all of these.

perpendicular.

Light that consists of more than one color is known as ___________ . polychromatic monochromatic diffracted iridescent polarized

polychromatic

An opaque object is yellow when illuminated with white light. What color is it when viewed through a red transparency? black red cyan magenta yellow green blue

red

What color is a normally red object when illuminated with magenta light? red blue green cyan yellow magenta white black

red

What color light is absorbed by a piece of cyan glass? green red blue magenta cyan yellow

red

Which color of light has the longest wavelength in a vacuum? red orange yellow green blue violet all have the same wavelength in a vacuum

red

Polarized sunglasses are used at the beach to mainly reduce glare that has been polarized by _________________. transmission scattering refraction reflection

reflection

Polarized sunglasses are used at the beach to mainly reduce glare that has been polarized by _________________. reflection refraction scattering transmission

reflection

The polarization of light using calcite (Iceland spar) is an example of polarization by _________________. scattering refraction reflection transmission

refraction

As the diameter of a lens decreases, its focal length.... increases. decreases. remains unchanged. all of the above are possible

remains unchanged

Diffraction is more pronounced through relatively small openings. large openings. same for each neither

small openings.

The larger a material's index of refraction, the ____________ its critical angle will be. smaller larger Neither of these. There is no relation between a material's index of refraction and its critical angle.

smaller

Images formed by converging lenses are _____________ enlarged.

sometimes

Images formed by converging lenses are _____________ inverted.

sometimes

Images formed by converging lenses are _____________ reduced. always sometimes never

sometimes

Images formed by converging lenses are _____________ the same size as the object. always sometimes never

sometimes

Images formed by converging lenses are _____________ upright. always sometimes never

sometimes

Images formed by converging lenses are _____________ virtual.

sometimes

Refraction of light is defined as the result of the superposition of two or more light waves in a single medium. the change of direction of light as it passes obliquely from one medium into another of different propagation speed. the turning back of light as it reaches the boundary of the idium through which it is traveling. the spreading of light around a barrier or through an opening.

the change of direction of light as it passes obliquely from one medium into another of different propagation speed.

When polychromatic light is viewed through a spectroscope, the innermost color seen will be... the color with the longest wavelength. the color with the shortest wavelength. green. the brightest color.

the color with the shortest wavelength.

When light passes through an ordinary window pane, its angle of emergence from the glass back into the air is always less than its angle of incidence from the air into the glass. usually less than its angle of incidence from the air into the glass. the same as its angle of incidence from the air into the glass. usually more than its angle of incidence from the air into the glass. always more than its angle of incidence from the air into the glass.

the same as its angle of incidence from the air into the glass.

An object's index of refraction allows us to directly calculate the speed of light in that object. the frequency of light in that object. the color of light in that object. the wavelength of light in that object.

the speed of light in that object.

Optical density refers to how thick the medium is. how heavy the medium is. the speed of light in the medium. whether or not light can travel through the medium. all the above

the speed of light in the medium.

Converging lenses are thicker in the middle than in the edges. thinner in the middle than in the edges. lenses that have one flat side.

thicker in the middle than in the edges.

Diverging lenses are thinner in the middle than in the edges. lenses that have one flat side. thicker in the middle than in the edges.

thinner in the middle than in the edges.

When light passes from a medium with a lower index of refraction value into a medium with a higher index of refraction value, it will bend _______ the normal. toward away from

toward

Polarization is a property of... longitudinal waves. both transverse and longitudinal waves. transverse waves. neither transverse not longitudinal waves.

transverse waves.

A light wave that is vibrating in more than one plane is referred to as ____________________ light. polychromatic monochromatic unpolarized polarized

unpolarized

Light travels fastest in cool air. warm air. humid air. a vacuum.

vacuum

The polarization axes of ordinary sunglasses are... circular. opposite in each lens. vertical. horizontal.

vertical.

Suppose you have a radioactive rock with a mass of 1000 g. You lock the rock safely away in a closet and do not disturb it for 6 years. What will be mass of the rock be after those 6 years if the half-life of the sample is 2 years? very slightly less than 1000 g 250 g 125 g 62.5 g

very slightly less than 1000 g

Which color of light has the greatest frequency in a vacuum? red orange yellow green blue violet all have the same frequency in a vacuum

violet

The complementary color of blue is red. cyan. yellow. magenta. green.

yellow.