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(C) Robert Emerson and his colleagues observed that the quantum yield of photosynthesis drops significantly when the wavelength of light is increased

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Emerson and Arnold - Red Drop

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(C) Robert Emerson and his colleagues observed that the quantum yield of photosynthesis drops significantly when the wavelength of light is increased beyond $680 \ nm$ (in the far-red region). This phenomenon is known as the $Red \ Drop$ effect. The reason for this decrease is that at wavelengths greater than $680 \ nm$,only $Photosystem \ I$ $(PSI)$ is functional,while $Photosystem \ II$ $(PSII)$ becomes inactive,leading to a lack of electrons for the electron transport chain and reduced production of $NADPH$ and $ATP$.

If the wavelength of light exceeds $680 \ nm$,the rate of photosynthesis decreases. Which scientist demonstrated this,and what was the reason?

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