Unit 3 Lesson 6 Review

What is the temperature of cosmic background radiation today?

• about 3 Kelvin

• about 270 °C

• almost absolute zero

• above 3,000 °C

A light-year is a measure of

• Time

• Distance

• Age

• Speed

What is important about Hubble’s discovery that there is a red shift in the spectra of galaxies?

• It suggests the existence of spiral galaxies.

• It suggests the existence of black holes.

• It suggests that the universe is expanding.

• It suggests that the universe is contracting.

Tags

NGSS.HS-ESS1-2

What characteristic of the Cosmic Microwave Background Radiation (CMBR) provides evidence that the universe is expanding

• The CMBR arriving at Earth has been blue shifted.

• The CMBR can be detected coming from all directions.

• Any microwave radiation is an indication of expansion.

• The hydrogen-to-helium ratio in the CMBR matches predictions of the BBT

Tags

NGSS.HS-ESS1-2

When did the universe begin?

• 1 billion years ago

• 14 billion years ago

• 10 million years ago

• 50 billion years ago

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NGSS.HS-ESS1-2

What law can be used to estimate the distance to a galaxy?

• Hubble's Law

• Charles' Law

• Birdsell's Law

• Boyle's Law

During the first few minutes after the Big Bang, the universe was opaque. Light could not go through it. Why?

• All the photons were being absorbed.

• There was nothing to produce photons.

• The photons were attracted to other particles.

• The photons were attracted to other particles.

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NGSS.HS-ESS1-2

What determined the temperature, density, and ratio of hydrogen to helium of the universe soon after the Big Bang?

• the rate at which the universe expanded

• the density of the material the universe was expanding into

• the timing of the transition from an opaque to a transparent universe

• the rate of nuclear fusion in the first stars

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NGSS.HS-ESS1-2

How far does light travel in 1 year

• 94.6 Trillion Km

• 9.46 Trillion Km

• 4.73 Trillion Km

• 47.3 Trillion Km

Light travels at what speed?

• 18,000 miles/second

• 1,800 miles/second

• 180,000 miles/second

• 1,8000,000 miles/second

Tags

NGSS.HS-PS4-1