Explanation:
In photoelectric effect when monochromatic radiations of suitable frequency fall on the photo-sensitive plate called cathode, the photoelectrons are emitted which get accelerated towards the anode. These electrons flow in the outer circuit resulting in the photoelectric current.
Using the incident radiations of a fixed frequency, it is found that the photoelectric current increases linearly with the intensity of incident light.
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${C_2}{H_4}O\left( g \right) \to C{H_4}\left( g \right) + CO\left( g \right)$
if the initial pressure of $C_2H_4O(g)$ is $80\ mm$ and the total pressure at the end of $20\ minutes$ is $120\ mm$ ........... $mm$
(Rounded off to the nearest integer) [Assume : $\ln 10=2.303, \ln 2=0.693$ ]