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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A monochromatic beam of light (lamda = 4900A) incident normally upon a surface produces a pressure of 5 x 10^(-7) N/m^(-2) on it. Assume that 25% of the light incident in reflected and the rest absorbed. Find the number of photons falling per second on a unit area of thin surface

A monochromatic beam of light (lamda = 4900A) incident normally upon a surface produces a pressure of 5 x 10^(-7) N/m^(-2) on it. Assume that 25% of the light incident in reflected and the rest absorbed. Find the number of photons falling per second on a unit area of thin surface

A gas hydrogen like atoms can absorb radiations of 68eV. Consequently A is ahead of B in phase by 66^@. If the observation be taken from point P Among the two interfering monochromatic sources A and B such that PB-PA=lambda//4. Then the phase difference between the waves from A and B reaching P is