Answers Crowley Credit Recovery Physics BAtomic Spectra

Atomic Spectra — Unit test Answers

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Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions.

X: Smaller nuclei formY: Thermal energy is producedZ: A larger nucleus forms

X: Large amounts of energy are releasedY: One or more neutrons is releasedZ: Smaller nuclei form

X: One or more neutrons is releasedY: A larger nucleus formsZ: Large amounts of energy are released

X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei form

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A Hertzsprung-Russel diagram is shown.

red giants

white dwarfs

supergiants

main sequence

Clara made a chart to summarize some of the evidence that supports the big bang theory.Which best describes Clara’s error?

During redshift, the light source and observer move closer together, not farther apart.

The CMB is blue-shifted, not red-shifted, to the microwave region.

The temperature of the CMB is cooler, not hotter, than at the time of the big bang.

The redshift indicates approaching, not receding, galaxies.

The emission spectrums are known for the elements below.What elements are in the unknown sample? Select 2 options.

boron

lithium

hydrogen

helium

potassium

Which statements describe the use of gamma rays to treat cancer? Check all that apply.

Gamma rays have low energy and a source must be placed in the body.

Gamma rays are absorbed by only the cancer cells.

High-energy gamma rays are directed at a tumor from outside of the body.

Gamma rays kill cancer cells in a tumor.

Gamma rays are applied to a large area of the body.

Seven-eighths of a sample of hydrogen-3 will have become a stable isotope after 36.9 years. What is the half-life of hydrogen-3?

12.3 years

18.5 years

32.3 years

36.9 years

What is luminosity?

the amount of energy a star emits in a unit of time

the brightness of a star as seen from Earth

the average temperature of a star during its life cycle

the degree of shift toward the red end of the spectrum

Which best describes the present-day universe?

opaque, expanding very slowly, stars produce heavy elements

transparent, expanding at an accelerated rate, stars produce heavy elements

opaque, expanding at an accelerated rate, stars produce only hydrogen and helium

transparent, expanding very slowly, stars produce only hydrogen and helium

What is the study of the spectra produced from the emission and absorption of electromagnetic radiation?

study of absorption spectrums

study of emission spectrum

nanotechnology

spectroscopy

Mimi makes a table about the two types of beta decay.What error did Mimi make?

No change in mass number occurs in beta minus decay.

The changes to atomic number are reversed.

A proton is released in beta plus decay.

The changes to the nucleus are reversed.

What are some applications of the field of spectroscopy? Select 5 options.

for identifying elements in a sample

for determining the distance and velocity of galaxies

for producing neon lights

for determining types of chemical bonds

for use in medical imaging devices

for killing bacteria in foods

What hazard is associated with ionizing radiation?

It causes radiation sickness as a result of any exposure.

It undergoes radioactive decay, which can damage DNA in cells.

It creates charged particles that can take part in chemical reactions in cells.

It destroys atoms in molecules, which can cause genetic mutations.

Which best describes fusion nuclear reactors?

They use rods containing uranium for fuel.

They are currently used for electricity in several highly populated countries.

They are used in some naval vessels, such as submarines.

They have been successful, but they are very expensive to operate.

Which statement describes why energy is released in a nuclear fission reaction based on mass-energy equivalence?

For large nuclei, the mass of the original nucleus is greater than the mass of the products.

For large nuclei, the mass of the original nucleus is less than the mass of the products.

For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.

For small nuclei, the binding energy of the lighter nuclei is less than the binding energy of the heavier nucleus.

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Atomic Spectra — Unit test Answers

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