- Is A.D.D. caused by a mutation?

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Strontium-90 has a half life of 28.1 years. How long will it take for 4.00 g to be reduced to .600 g? A photon has a wavelength of 617 nm. Calculate the energy of the photon in joules. Enter your answer in scientific notation.? Tritium has a half-life of 12.26 yrs. What fraction of the tritium is lost in 2.5 yrs? What is the wavelength (in meters) of an electromagnetic wave whose frequency is 5.86x10^8 Hz? The inverse of the function f(x) = 21 - 32x would be:?

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