Semester 1 Review

Front

What is the independent variable in a graph?

Back

The independent variable is the variable that is changed or controlled in a scientific experiment to test its effects on the dependent variable. In the context of a graph, it is typically plotted on the x-axis.

Front

What is the speed of electromagnetic waves in a vacuum?

Back

All electromagnetic waves, including radio waves, visible light, and gamma rays, travel at the same speed in a vacuum, which is approximately 299,792 kilometers per second (the speed of light).

Front

What is nucleosynthesis?

Back

Nucleosynthesis is the process by which new atomic nuclei are created from existing nucleons (protons and neutrons). This process occurs in stars and during events like supernovae.

Front

How are elements heavier than iron formed?

Back

Elements heavier than iron are formed when a red supergiant star explodes as a supernova, allowing for the creation of heavier elements through rapid neutron capture.

Front

What is the correct sequence of stellar evolution?

Back

The correct sequence is: nebula, protostar, main sequence, red giant.

Front

What is a nebula?

Back

A nebula is a giant cloud of dust and gas in space, often the birthplace of stars.

Front

What is a protostar?

Back

A protostar is an early stage in the formation of a star, where the gas and dust in a nebula begin to collapse under gravity.

Front

What is a red giant?

Back

A red giant is a late stage in the life cycle of a star, characterized by a large size and a reddish color, occurring after the star has exhausted its hydrogen fuel.

Front

What is a supernova?

Back

A supernova is a powerful and luminous explosion of a star, marking the end of its life cycle, often resulting in the formation of neutron stars or black holes.

Front

What is the difference between independent and dependent variables?

Back

The independent variable is the one that is manipulated or changed, while the dependent variable is the one that is measured or observed in response to changes in the independent variable.