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Visible light, with a frequency of 6.0 *1014 Hz, is reflected from a spaceship moving directly away at a speed of 0.90c.The frequency of the reflected waves observed at the source is:
Self-controlled
Having the ability to regulate one's emotions, thoughts, and behavior in the face of temptations and impulses.
Cultural
Pertaining to the customs, arts, social institutions, and achievements of a particular nation, people, or other social group.
Survival
The state of continuing to live or exist, often despite hardship or danger.
Economic
Relating to the system that involves the production, distribution, and consumption of goods and services within a society.
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