A) 400 to 700 nm
B) 450 to 950 nm
C) 340 to 450 nm
D) 500 to 600 nm
Correct Answer: A
Solution :
The cosmic rays, X-rays, UV-rays, the visible spectrum, infra red rays, radio waves, coming from sun are constituted electromagnetic spectrum. The waves of each of these type have a characteristic range of wavelengths. The visible spectrum, which is also known as Photosynthetic Active Radiation (PAR), has a range of wavelength of 380 nm to 760 nm. This part of electromagnetic spectrum is responsible for photosynthesis.
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