A photo-cell connected in an electrical circuit is placed at distance d from a source of light as a result current I flow in the circuit what will be the current in the circuit when the distance is increased to 2d?
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Intensity: energy of light passing through per unit area per unit time is known as intensity of light. 1 22 = i = current flows in the circuit, d = distance between the source of light and cathode. current ∝ 1 2d Einstein's Photo Electric Equation 2 max or hv eV. With the help of photo cell, light is converted into electrical energy.
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Intensity will be reduced as inversely proportion to distance
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