Unit Test — Unit test Answers

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The table below shows the wavelengths of visible light that correspond to different colors.A student analyzes the emission spectrum of an unknown element and observes strong lines at the following wavelengths: 656 nm, 486 nm, 434 nm.Which absorption spectrum is the student most likely viewing?

A line spectrum with one black line in purple, blue, light blue and red.

A line spectrum with 3 black lines in purple, one black line in blue, 2 black lines in light blue, one black line in orange and one black line in orange-red.

A line spectrum with 3 black lines in purple, 2 black lines in blue, 2 black lines in light blue, one black line in green and one black line in yellow.

A line spectrum with 4 black lines in blue, 6 black lines in green, 3 black lines in yellow and one black line in orange.

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Which statement correctly describes mass-energy equivalence?

All energy in the universe will be converted to an equivalent amount of mass.

Mass can decrease in nuclear changes without the production of energy.

All energy in the universe is a result of mass being converted into energy.

A large amount of mass is equivalent to a small amount of energy.

The bright light emission spectrums below are seen through a spectroscope. The unknown sample is a mixture of the observed gases.Which gases are found in the unknown sample?

gases W and Z

gases X and Y

gases W and Y

gases Z and Y

Carlos is studying the characteristics of a fundamental force. The force is sometimes repulsive and sometimes attractive.

gravitational or strong nuclear

electromagnetic or weak nuclear

weak nuclear or strong nuclear

electromagnetic or gravitational

Which describes why radioisotopes can be used as tracers in studying the biological and chemical processes of plants?

The radioisotope is chemically identical to the nonradioisotope the plant normally uses.

The radioisotope is absorbed more quickly than the nonradioisotope the plant normally uses.

The radioisotope converts the nonradioisotope normally used by a plant into a radioisotope.

The radioisotope travels through the plant without participating in any chemical processes.

Which is not a form of ionizing radiation?

ultraviolet light

gamma rays

X-rays

infrared light

What is the energy equivalent of an object with a mass of 2.5 kg?

5.5 × 108 J

7.5 × 108 J

3.6 × 1016 J

2.25 × 1017 J

Which are methods of reducing exposure to ionizing radiation? Check all that apply. using a lead apron during medical X-rayspicking up radioactive material by hand to avoid dropping ittaking an X-ray image of large areas of the body at onceusing a short burst of X-rays to take an imagetaking an image of the smallest possible area

using a lead apron during medical X-rays

picking up radioactive material by hand to avoid dropping it

taking an X-ray image of large areas of the body at once

using a short burst of X-rays to take an image

taking an image of the smallest possible area

Which imaging technique uses radiation that is emitted from the material being imaged?

X-ray radiography

MRI

CT scan

sonography

Gazala makes a graphic organizer to compare nuclear fission and nuclear fusion.

X: Provides household electricityY: Has rods containing uranium

X: Provides household electricityY: Requires high temperature and pressure

X: Converts mass into energyY: Does not produce usable amounts of energy

X: Converts mass into energyY: Is controlled by neutron absorption

Which two terms best describe the gravitational force?

strongest, repulsive

weakest, repulsive

strongest, attractive

weakest, attractive

is strongeris weakerattracts onlyrepels only

is stronger

is weaker

attracts only

repels only

Which phenomena support only the particle theory of light? Select 2 options.reflectionbending around objectstraveling in a straight pathinterferencephotoelectric effect

reflection

bending around objects

traveling in a straight path

interference

photoelectric effect

The diagram shows a model of a nuclear change.

nuclear fission, because nuclei combine

nuclear fission, because a nucleus breaks apart

nuclear fusion, because nuclei combine

nuclear fusion, because a nucleus breaks apart

The nuclear equation is incomplete.

Superscript 138 Subscript 54 Baseline X e

Superscript 139 Subscript 54 Baseline X e

Superscript 119 Subscript 54 Baseline X e

Superscript 138 Subscript 52 Baseline T e

Heinrich Hertz used properties of which type of wave to support the idea that light is also made of waves?

infrared

gamma

microwave

radio

Which characteristics of a radioisotope make it useful for diagnosing medical problems?

a long half-life and it is taken up by a specific part of the body

a long half-life and it is not taken up by the body

a short half-life and it is taken up by a specific part of the body

a short half-life and it is not taken up by the body

What type of spectrum is shown below?

absorption

electromagnetic

emission

infrared light

Which are advantages of using nuclear reactors to generate electricity? Select 3 options.Nuclear power produces no hazardous byproducts.Nuclear power has a high output.Nuclear power uses nonharmful fuel.Nuclear power is readily available.Nuclear power produces relatively low carbon dioxide emissions.

Nuclear power produces no hazardous byproducts.

Nuclear power has a high output.

Nuclear power uses nonharmful fuel.

Nuclear power is readily available.

Nuclear power produces relatively low carbon dioxide emissions.

Which statements are supported by the graph? Check all that apply.

For large atoms, more neutrons than protons are needed to be stable.

Nuclei that have 90 or greater protons are always radioactive.

Atoms must have equal numbers of protons and neutrons to be stable.

Atoms that have less than 10 protons do not need neutrons to be stable.

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