The Detection of Neutrinos from Supernova SN 1987A Occurred 3

question 392

Multiple Choice

The detection of neutrinos from supernova SN 1987A occurred 3 hours before the detection of the burst of visible light.What caused this time lag?

• A) Neutrinos travel faster in a vacuum than light does.
• B) The space between the supernova and Earth is not a perfect vacuum but is filled with very rarified gas and dust, which impedes the passage of light (very slightly) but not of neutrinos.
• C) The neutrinos and the light were produced at the same time, but the light bounced back and forth between the core and the outer layers several times before these layers expanded to the point that they became transparent.
• D) The neutrinos were produced earlier (when the core collapsed) and the light was produced 3 hours later (when the shock wave reached the outer layers).

Recognize the importance of environmental factors and community infrastructure in disease prevention.

Understand the historical development of public health initiatives and their impact on community health.

Analyze the role of government and non-governmental organizations in the advancement of public health.

Identify key figures and their contributions to public health and nursing.

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Definitions:

Pensions

Retirement plans funded either by employers or governments, providing income to individuals upon retirement.

GAAP

Generally Accepted Accounting Principles; the standard framework of guidelines for financial accounting used in any given jurisdiction, particularly in the United States.

Projected Benefit Obligation

The present value of estimated future payments required to settle the obligations of a pension plan over its employees' expected future service.

Plan Assets

Assets that are held by a retirement plan from which the benefits to the participants are to be paid.