amu and percent abundance of 0.722. What is the mass of the other isotope of X? QUESTION 3 A radiation detector exposed to sunlight records the energy falling on a given area per unit time. If 1.82 x1018 photons are striking each cm in one minute for such a detector, what output data should the detector show? Assume the average wavelength of sunlight is 460 nm. h = 6.636x10-14 J s; C = 2.998x10 m s-1