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# The absorptivity of Platinum black is(A) 0.91(B) 0.98(C) 1.00(D) 0.99

Last updated date: 11th Sep 2024
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Hint: We should know that in science, absorptivity may refer to: Molar absorptivity, in chemistry, a measurement of how strongly a chemical species absorbs light at a given wavelength. Absorptance, in physics, the fraction of radiation absorbed at a given wavelength. For an arbitrary body emitting and absorbing thermal radiation in thermodynamic equilibrium, the emissivity is equal to the absorptivity. Absorptivity ($\alpha$) is a measure of how much of the radiation is absorbed by the body. Reflectivity ($\rho$) is a measure of how much is reflected, and transmissivity ($\tau$) is a measure of how much passes through the object. Emissivity ($\varepsilon$) is a measure of how much thermal radiation a body emits to its environment.

Thus, we can say that, the algebraic sum of ALL the currents entering and leaving a node must be equal to zero, ${{I}_{(exiting)}}+\text{ }{{I}_{(entering)}}=\text{ }0$. This idea by Kirchhoff is commonly known as the Conservation of Charge.