Law of Lamberts Cosine
State the law of Lamberts Cosine? Describe briefly?
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The law of Lamberts Cosine states that the radiant energy from any small surface area dA in any direction θ associative to the surface normal is proportional to the Cos θ. In case of diffused reflection the source is directional however reflection is uniform. When I is the intensity, then according to the law of Lamberts Cosine, Intensity -> (Proportional) Cos θ
Permittivity of free space: electric constant; epsilon_0: The ratio of the electric displacement to the intensity of the electric field generating it in vacuum. It is equivalent to 8.854 x 10-12 F/m.
A thermocouple of K type is suddenly exposed to air with temperature of 1273K, Initial temperature was 293 K. Calculate the time needed for the thermocouple read the temperature with accuracy of better that 99%. Ignore radiation and conduction. The measuring element has a ball shape of diameter o
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Lumen: lm: The derived SI unit of luminous flux, stated as the luminous flux produced by a uniform point source of 1 cd releasing its luminous energy over a solid angle of 1 sr; it therefore has units of cd sr.
What do you mean by the term wave fronts? Explain in short.
Briefly explain the procedure to compute the tensile strength?
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