An Astronomer Claims That the Large Redshifts of All Quasars

question 14

Multiple Choice

An astronomer claims that the large redshifts of all quasars are caused by some new mechanism and not the expansion of the universe. The redshift tells us nothing, he says, about where any quasar is located. Which of the following would be a way to disprove his view of quasars?

• A) observe one quasar at all wavelengths of the electromagnetic spectrum
• B) find a number of cases where a quasar seen in a cluster of galaxies has the same redshift as all the galaxies in the cluster
• C) find a number of quasars that seem associated with a galaxy that has a different redshift from the quasar
• D) measure carefully how long the quasar takes to undergo regular changes in its light output
• E) demonstrate by observing many quasars that brighter-looking quasars have higher redshifts

Describe strategies for combating fungal parasites in aquaculture.

Explain the ecological roles of fungi in ecosystems and their impact on global cycles.

Understand the basic principles and components required for combustion.

Identify the chemical and physical properties of materials involved in fires.

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Definitions:

Payables

Short-term liabilities or money owed by a company to suppliers or creditors for goods and services received.

Rebate

A partial refund to someone who has paid too much money for tax, rent, or a utility, or an incentive payment to induce a particular purchase or behavior.

Cash Balance

The amount of cash in a company's accounts at any given time, important for ensuring liquidity and operational compatibility.