Answers WV-Earth and Space Science A-CREarth-Moon-Sun System

Earth-Moon-Sun System — Unit test Answers

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What type of spectrum is produced when electromagnetic radiation is emitted or absorbed as electrons change energy levels in an atom? ( Please list one word only and lower case )

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Cecelia dropped a ball from a height of 2 m. The ball fell in a straight path down to the ground.

tossing it horizontally at a slower speed

tossing it horizontally at a faster speed

dropping it from a shorter distance

dropping it from a greater distance

The orbital period of a satellite is 2 × 106 s and its total radius is 2.5 × 1012 m. The tangential speed of the satellite is m/s. (Round to the nearest whole number, do not add any punctuation.)

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Hakeem wants to explain why only one side of the moon is visible from Earth. Which comparison would provide the best support?

the orbital period of Earth with the rotational period of the moon

the orbital period of the moon with the rotational period of the moon

the orbital period of the moon with the rotational period of the Earth

the orbital period of Earth with the orbital period of the moon

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

boron

lithium

hydrogen

helium

potassium

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

Which best describes nuclear fusion?

A nucleus spontaneously splits and absorbs energy.

Two nuclei spontaneously combine and absorb energy.

A nucleus collides with a neutron and splits, releasing energy.

Nuclei combine to form a heavier nucleus, releasing energy.

Which type of reaction does this diagram represent?

a chain reaction that is caused by nuclear fission

a chain reaction that is caused by nuclear fusion

a decrease in energy that is caused by nuclear fission

an increase in energy that is caused by nuclear fusion

Consider the three equations below.Which statement do these reactions best support?

Beta decay occurs only in certain atoms.

Alpha decay occurs only in certain atoms.

Chain reactions play important roles in the process of nuclear fission.

Nuclear fusion plays an important role in making elements that are heavier than helium.

Which best describes what forms in nuclear fission?

two smaller, more stable nuclei

two larger, less stable nuclei

one smaller, less stable nucleus

one larger, more stable nucleus

Which statement is supported by Kepler’s laws?

The closer a planet is to the Sun, the faster it moves.

The farther a planet is from the Sun, the faster it moves.

As a planet moves away from the Sun, its gravitational force increases.

As a planet moves away from the Sun, its gravitational force remains the same.

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.

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 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

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Earth-Moon-Sun System — Unit test Answers

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