Question

What is PAR range?

• A. 200 nm - 800 nm
• B. 400 nm - 700 nm
• C. 350 nm - 550 nm
• D. 600 nm - 100 nm

Answer 1

Answer: (B)

Light is the visible part of electromagnetic radiations. Sunlight or solar radiations reaching the earth have a wavelength between 300 nm to 2600 nm. Part of the spectrum used in photosynthesis has a wavelength between 400 - 700 nm. It is called photosynthetically active radiations (PAR).