In Contrasting the Distribution of the X-Ray and Gamma-Ray Bursts

question 16

Multiple Choice

In contrasting the distribution of the X-ray and gamma-ray bursts, we find:

• A)gamma-ray bursts are far closer to us, so they appear more luminous.
• B)gamma-ray bursts are far beyond our Galaxy, at cosmological distances, and spread all overthe sky, not in the plane of our Galaxy.
• C)gamma-ray bursts are more closely associated with open than globular clusters.
• D)gamma-ray bursts can repeat, while the X-ray bursts do not.
• E)gamma-ray bursts can be observed from the ground, but X-rays are blocked by the ionospherefor ground-based observers.

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Definitions:

Machine-Hours

A measure of production output or operation, indicating the total hours machines are running in the manufacturing process.

Markup

The surcharge applied to the original cost of items to compensate for overhead expenses and secure earnings.

Plantwide Predetermined Rate

A single overhead rate calculated using the total estimated overhead costs divided by an estimated allocation base for an entire factory or plant.

Machine-Hours

A measure of the time that a machine is in operation, used in costing and operational analysis.