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Unit Test — Unit test Answers

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Yanni is sitting in the stands watching a football game. The quarterback runs forward toward the end zone and throws a pass straight downfield to a player for a touchdown. The quarterback ran at a speed of 8 m/s and threw the ball with a speed of 15 m/s.

For Yanni, the speed of the ball is 23 m/s, and for the quarterback, the speed of the ball is 15 m/s.

For Yanni, the speed of the ball is 15 m/s, and for the quarterback, the speed of the ball is 8 m/s.

For both Yanni and the quarterback, the speed of the ball is 23 m/s.

For both Yanni and the quarterback, the speed of the ball is 15 m/s.

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Daniel observed and compared some stars at night and recorded his observations in a chart.Daniel later discovered that star X is farther away from Earth than the other stars he observed, and star Z is closest to Earth.

Star X is more luminous than both stars Y and Z.

Star X is more luminous than star Z, but not star Y.

Star Y is more luminous than star X.

Star Z is more luminous than star Y.

Suppose a rocket is traveling through space and moving at a speed close to the speed of light. Three minutes pass on the rocket.

less than three minutes because of time dilation

more than three minutes because of time dilation

three minutes because time is absolute

less than or greater than three minutes depending on the speed

The emission spectrum of iodine is shown below.Which is the absorption spectrum?

A line spectra with 4 purple lines, 6 blue lines, 3 light blue lines, 5 green-blue lines, 6 green lines, 7 yellow lines, 3 orange lines and 14 red lines.

A line spectra with 6 purple lines, 9 blue lines, 6 light blue lines, 3 green-blue lines, 6 green lines, 2 yellow lines, 5 orange lines and 10 red lines.

A line spectra with 2 black lines in purple, 6 black lines in blue, 3 black lines in light blue, 1 black line in green-blue, 10 black lines in green, 8 black lines in yellow, 6 black lines in orange and 8 black lines in red.

A line spectra with 4 black lines in purple, 8 black lines in blue, 6 black lines in light blue, 3 black line in green-blue, 10 black lines in green, 4 black lines in yellow, 4 black lines in orange and 12 black lines in red.

Which describes time dilation?

The faster an object moves, the more stretched time becomes.

The more slowly an object moves, the more stretched time becomes.

The faster an object moves, the more time it takes for light to travel a given distance.

The faster an object moves, the less time it takes for light to travel a given distance.

Jin is standing still and watching an archer on a horse traveling away from a target. The archer is moving at a speed of 4 m/s and shoots the arrow toward the target with a speed of 17 m/s.

For Jin, the speed of the arrow is 21 m/s, and for the archer, the speed of the arrow is 4 m/s.

For Jin, the speed of the arrow is 13 m/s, and for the archer, the speed of the arrow is 17 m/s.

For both Jin and the archer, the speed of the arrow is 21 m/s.

For both Jin and the archer, the speed of the arrow is 17 m/s.

After the supernova in a star’s life cycle, what else is formed in addition to a nebula?

red giant or protostar

neutron star or red giant

protostar or black hole

black hole or neutron star

Kathy drew a timeline to show some of the major events that occurred during the evolution of the universe.Which best describes Kathy’s error?

Quarks and electrons formed at 10–35 s, not 10–10 s.

Protons formed first, then neutrons formed at 100 s.

Nebulae formed around 109 y after hydrogen and helium formed.

Hydrogen and helium were created at 3000 s, before nebulae formed.

According to the special theory of relativity, what is the fourth dimension?

energy

space

time

mass

The presence of which element would indicate that a star is going through a high-mass star life cycle as opposed to a low-mass star life cycle?

hydrogen

carbon

helium

iron

Which statement is part of Bohr's atomic model?

Electrons absorb or emit light when they change energy levels.

Electrons with the highest energy are found with orbits of the smallest radius.

Electrons exist as waves and clouds of probability with specific orbits and shapes.

Electrons orbit the nucleus in narrow ellipses, like how the planets orbit the Sun.

Alana drew a diagram to compare the life cycles of low-mass and high-mass stars.

X: Nuclear fusion forms hydrogen in the main sequence star.Y: A white dwarf is part of the cycle.Z: A supernova is part of the cycle.

X: A white dwarf is part of the cycle.Y: Nuclear fusion forms hydrogen in the main sequence star.Z: A supernova is part of the cycle.

X: A protostar is part of the cycle.Y: It begins in a nebula.Z: nuclear fusion forms hydrogen in the main sequence star.

X: It begins in a nebula.Y: Nuclear fusion forms hydrogen in the main sequence star.Z: A protostar is part of the cycle.

Basim’s robotics team builds a robot that travels at 9 m/s and can fire a tennis ball at a target.

The robot fires the ball forward with a speed of 7 m/s.

The robot fires the ball backward with a speed of 7 m/s.

The robot fires the ball backward with a speed of 2 m/s.

The robot fires the ball forward with a speed of 2 m/s.

What type of spectrum is shown below?

absorption

electromagnetic

emission

infrared light

A green dot in the middle of 4 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2. The third circle away from the green dot is labeled n = 3 and the last is labeled n = 4. There is an arrow from n = 4 to n = 1 labeled A. There is an arrow from n = 3 to n = 2 labeled B. There is an arrow from n = 3 to n = 1 labeled C. There is an arrow from n = 2 to n = 1 labeled D.

Victor drew a diagram to show the life cycle of a low-mass star.

red supergiant

black hole

white dwarf

supernova

Scientists discovered that stars in the universe are mostly composed of which elements?

hydrogen and helium

hydrogen and oxygen

oxygen and nitrogen

helium and nitrogen

Four students made a graphic organizer describing the parts of the atom.Which table best describes the parts of the atom?

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, 0, negative. The last column is labeled location with entries outside nucleus, outside nucleus, inside nucleus.

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries negative, 0, negative. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries 0, negative, positive. The last column is labeled location with entries outside nucleus, inside nucleus, inside nucleus.

A 3 column table with 3 rows. The first column is labeled particle with entries proton, electron, neutron. The second column is labeled charge with entries positive, negative, 0. The last column is labeled location with entries inside nucleus, outside nucleus, inside nucleus.

Changes in the appearance of emission and absorption spectrums are caused by the activities of

protons.

electrons.

neutrons.

neutrinos.

What is the origin of all stars?

supernova

dwarfs

protostars

nebulae

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