A Spaceship Is Designed to Support Animal Life for a Multiyear

A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Since the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed. What wavelengths of light should be used to maximise plant growth with a minimum of energy expenditure?

A) full-spectrum white light
B) green light
C) a mixture of blue and red light
D) UV light

Correct Answer:

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