Cygnus X-1 Is a Binary System with One Component Not

question 43

Multiple Choice

Cygnus X-1 is a binary system with one component not visible. What must the unseen component mass be for astronomers to be confident that this system contains a black hole?

• A) less than 0.4 solar masses
• B) between 0.4 and 1.4 solar masses
• C) less than 3 solar masses
• D) more than 3 solar masses

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Definitions:

Marginal Utility

The incremental enjoyment or advantage a consumer receives from consuming one more unit of a good or service.

Macaroni and Cheese

A popular dish made with macaroni pasta and a cheese-based sauce, often baked or otherwise prepared as comfort food.

Negative

Used to describe values less than zero, situations of decrease or loss, or aspects considered undesirable or harmful.

Diminishing Marginal Utility

The principle that as a person consumes more of a good, the satisfaction gained from consuming an additional unit decreases.