Write notes on Emerson's enhancement effect.

Explanation

Emerson conducted experiment in Chlorella using only one wavelenght of light (monochromatic light) at a time and he measured quantum yield. He plotted a graph of the quantum yield in terms of `O_(2)` evolution at variuos wavelenght of light. His focus was to determine at which wavelength the photochemical yield of oxygen was maximum . He found that in the wavelenght of 600 to 680 the yield was constant but suddenly dropped in the region above 680nm (red region). The fall in the photosynthetic yield beyond red region of the spectrum is referred as Red drop on Emerson's first effect .