Question

Wavelength of visible light, which is required for photosynthesis is

• A. 200 -400 nm.
• B. 390 -780 nm.
• C. 700 -900 nm.
• D. 100 -200 nm.

Answer 1

The correct option is B 390 -780 nm.

• A very small part of the electromagnetic spectrum can be seen by the human eye i.e., between the wavelengths 390 and 780 nm.
• This part of the electromagnetic spectrum is called a visible light spectrum.
• Within the spectrum the longer the wavelength of the radiation, the slower the vibration of the photons and the less energy each photon contains.
  Hence, correct option is B.