Question

Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column. Use each word only once. A blank predicts that the strong, weak, and electromagnetic forces should become indistinguishable at high temperatures. The blank is a single force that unifies the electromagnetic and weak forces. Blank was a dramatic expansion of the universe thought to have occurred when the universe was only a tiny fraction of a second. Blank forces us to think about why the sky is dark at night. Observations of the blank provide a way to test our theory of the big bang. When a particle of ordinary matter meets its precise opposite particle of antimatter, the result is blank with complete conversion of mass into energy.

Answer 1

The strong, weak, and electromagnetic forces become indistinguishable at high temperatures, forming a single force called the electroweak force. The Big Bang was a dramatic expansion of the universe. Observations of the cosmic microwave background radiation test the theory of the Big Bang.

Step-by-step explanation:

The words in the left-hand column can be matched to the sentences in the right-hand column as follows:

The word 'unify' predicts that the strong, weak, and electromagnetic forces should become indistinguishable at high temperatures.

The word 'electroweak' is a single force that unifies the electromagnetic and weak forces.The word 'Big Bang' was a dramatic expansion of the universe thought to have occurred when the universe was only a tiny fraction of a second.

The word 'dark' forces us to think about why the sky is dark at night.

Observations of the cosmic microwave background radiation provide a way to test our theory of the Big Bang.

When a particle of ordinary matter meets its precise opposite particle of antimatter, the result is annihilation with complete conversion of mass into energy.