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Sci-1020 Exam 1 Northwestern State Questions and Answers

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Sci-1020 Exam 1 Northwestern State Questions and Answers

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Sci-1020 Exam 1: Northwestern State
Questions and Answers

When did the universe begin? - ANSWER-13.7 billion years ago

How long after the universe was created did atoms form? - ANSWER-300,000 years

Quark - ANSWER-particles of matter that make up protons and neutrons (Hadrons)

Leptons - ANSWER-elemental particles that aren't influenced by strong interactions like
quarks

What are the two types of Leptons? - ANSWER-Charged Leptons = electrons
Neutral Leptons = electron neutrinos

The early universe was composed of: - ANSWER-75% Hydrogen and 25% Helium.

When did the first galaxies form ? - ANSWER-200 to 400 million years ago

When did our solar system form? - ANSWER-4.6 billion years ago

Hubble's Law - ANSWER-The observation that the farther away a galaxy is, the faster it
is moving away.

Law of Conservation of Energy - ANSWER-Energy cannot be created or destroyed

Quasars - ANSWER-super large (solar system size) galactic cores that put out more
light than whole galaxies

radioactive dating - ANSWER-gives us the age of items from the decay of radioactive
materials found within the object

What is a light year? - ANSWER-the distance light travels in one year

What is nuclear fusion? - ANSWER-The "combining" of two small nuclei to form a larger
nucleus

What happens to "Mass" during Nuclear Fusion? - ANSWER-Mass is lost, but is turned
into energy

Hydrogen Fusion - ANSWER-two protons are joined

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