Earth's Atmosphere Is Able to Gradually Refract Light Rays

question 14

Multiple Choice

Earth's atmosphere is able to gradually refract light rays:

• A) only when it is very dry.
• B) only when the sun is very high in the sky.
• C) because of the changing density of air as you get closer to the surface.
• D) because of air pollution that is present.

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Definitions:

Therbligs

Fundamental motions required for a worker to perform manual operations, used in the study of motion economy.

Work Sampling

A statistical technique used for analyzing the work performance and estimating the proportion of time spent by workers on different activities.

Stopwatch Time Study

A method of work measurement used to establish standard times for activities by observing and timing tasks using a stopwatch.

Simultaneous Motion Study

A technique in industrial engineering where tasks are analyzed in detail to identify and minimize wasted motions, enhancing efficiency.