2024 Fall Semester Final Review - Part 2

Front

What can you tell about the movement of distant galaxies?

Back

Distant galaxies are generally moving away from us due to the expansion of the universe.

Front

What happens to objects with opposite charges?

Back

Objects with opposite charges attract one another.

Front

What happens to objects with like charges?

Back

Objects with like charges repel one another.

Front

How does the mass of a star affect its lifetime?

Back

A star with a mass of 15 solar masses has a lifetime of about 10 million years.

Front

What is the independent variable in an experiment testing fertilizer effects on sunflower growth?

Back

The independent variable is the type of fertilizer used.

Front

How does increasing the frequency of a wave affect its speed in the same medium?

Back

Increasing the frequency of a wave does not change its speed in the same medium.

Front

What is the definition of a galaxy?

Back

A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

Front

What is the principle of charge interaction?

Back

The principle states that like charges repel and opposite charges attract.

Front

What is the relationship between a star's mass and its lifespan?

Back

Generally, more massive stars have shorter lifespans due to faster nuclear fusion rates.

Front

What is an independent variable in scientific experiments?

Back

An independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.