Spectrum is made of ____ colors?
Correct answer: A. 7
- A. 7
- B. 8
- C. 6
- D. 9
Explanation
A visible spectrum is traditionally described as seven colours: red, orange, yellow, green, blue, indigo and violet. This is commonly remembered by the sequence ROYGBIV.
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About Inventions and Discoveries
Inventions and Discoveries covers the people, dates, principles and practical uses behind developments such as the wheel, printing press, telephone, electricity, radio, computer, internet, vaccines and space technology. It distinguishes an invention, which creates a device or process, from a discovery, which identifies something already present in nature.
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