The Proper Time Between Two Events Is Measured by Clocks

question 60

Multiple Choice

The proper time between two events is measured by clocks at rest in a reference frame in which the two events:

• A)occur at the same time
• B)occur at the same coordinates
• C)are separated by the distance a light signal can travel during the time interval
• D)occur on the Earth's surface
• E)none of the above

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Definitions:

Hyposecretion

Abnormally reduced output of a secreted material. Compare with hypersecretion.

Growth Hormone

A hormone produced by the pituitary gland that stimulates growth, cell reproduction, and cell regeneration in humans and other animals.

Thyroxine

A substance created by the thyroid gland responsible for controlling metabolism, the production of energy, and the processes of growth and development.

Prolactin

Hormone secreted by the pituitary gland that stimulates cells of the mammary glands to produce milk in a nursing mother. Helps maintain water and electrolyte balance in fishes and amphibians. Inhibits metamorphosis in amphibians and stimulates molting in reptiles. Has a role in immune function and in the formation of new blood vessels.