Universe Galaxies Stars

What best describes the doppler effect?

• An apparent change in frequency of a wave due to the relative motion between a wave source and an observer

• When sound changes pitch

• When light changes color

• An apparent change in the amplitude of a wave due to the relative motion between a wave source and an observer.

Answer explanation

The Doppler effect is the apparent change in frequency of a wave due to the relative motion between a wave source and an observer. It is not related to changes in pitch or color, or changes in amplitude.

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NGSS.HS-PS4-1

If a star is being observed from Earth and it's light has shifted towards the blue side of the electromagnetic spectrum it would be...

• Moving towards the Earth

• Moving away from the Earth

• This is a trick question that cannot be answered

• It isn't a star, it is a very large blueberry.

Answer explanation

If a star's light has shifted towards the blue side of the spectrum, it means it is moving towards the Earth. This is known as a blue shift.

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

If a star is being observed from Earth and it's light has shifted towards the red side of the electromagnetic spectrum it would be...

• Moving towards the Earth

• Moving away from the Earth

• This is a trick question that cannot be answered

• It isn't a star, it is a very large blueberry.

Answer explanation

If a star's light has shifted towards the red side of the spectrum, it indicates that the star is moving away from the Earth.

Tags

NGSS.HS-PS4-1

The vast majority of galaxies in our universe are moving away from us.  We know this because we observe __________ in the galaxies absorption spectra.

• Redshift

• Blueshift

• Turbulance

• Superposition

Answer explanation

The redshift observed in the galaxies' absorption spectra indicates that the vast majority of galaxies in our universe are moving away from us.

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NGSS.HS-ESS1-2

Which of the following is NOT evidence of the Big Bang Theory?

• most galaxies are red-shifted

• CMBR everywhere

• the universe is gaining matter

• the universe is expanding

Answer explanation

The correct answer is 'the universe is gaining matter'. This is not evidence of the Big Bang Theory because the theory suggests that matter was created during the initial explosion and has been expanding since then.

Tags

NGSS.HS-ESS1-2

About how long ago do scientists believe the universe began?

• 13-14 billion years ago

• 13-14 million years ago

• 12-13 billion years ago

• 12-13 million years ago

Answer explanation

Scientists believe that the universe began approximately 13-14 billion years ago. This is based on extensive research and evidence from various scientific fields.

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NGSS.HS-ESS1-2

What were the original two elements in our universe?

• Lithium and Carbon

• Hydrogen and Neon

• Helium and Chlorine

• Hydrogen and Helium

Answer explanation

The original two elements in our universe are Hydrogen and Helium.

The event that marks the beginning of our known universe

• Theory of Evolution

• Big Bang Theory

• Cell Theory

• Blackhole theory

Answer explanation

The Big Bang Theory is the event that marks the beginning of our known universe.

Tags

NGSS.HS-ESS1-2

Which piece of evidence supports the Big Bang theory?

• The more distant galaxies are moving the slowest

• The more distant galaxies are moving the quickest

• The more distant galaxies are moving towards us

• Galaxies and space is not changing

Answer explanation

The more distant galaxies moving the quickest supports the Big Bang theory.

Tags

NGSS.HS-ESS1-2

What does the Big Bang theory suggest?

• The universe was just there

• The Milky Way is the only solar system

• The universe is continually expanding

• The universe started as a point and is moving towards each other

Answer explanation

The Big Bang theory suggests that the universe is continually expanding.

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NGSS.HS-ESS1-2