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A photon has a wavelength of 609 nm. Calculate the energy of the photon in joules. Enter your answer in scientific notation.? What is the chemical formula for barium chloride enneahydrate? What is the equation of the line that passes through the points (-3, 1) and (-5, 7) ? Point charges of 5micro and -3micro charge are placed 0.250m apart.If both C are +ve,where can a 3rd C be placed for the net force to be 0? What is the biological significance when an equilibrium is a saddle point?