WAEC Physics 2018 Theory — Question 10
Question 10 of 27 from the West African Examinations Council (WAEC) Physics 2018 Theory paper, with the correct answer and a full explanation.
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7.(b) What is a laser?
Model answer
A laser is a device that produces a highly coherent, nearly monochromatic and intense beam of light as a result of the cooperative stimulated emission of radiation from many atoms.
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