Final_Exam_Review_-_Practice_Problems_2013

# 17 determine the wavelength of photon if 68 photons

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17. Determine the wavelength of photon if 68 photons have 4.1 eV of energy. 18. Determine the energy (in eV) of 340 photons in a beam of light that has a wavelength of 210 nm. 19. Determine the wavelength (in nm) of photon if 78 photons have 139 eV of energy. 20. A sample of radioactive nuclide has 2.6x10 12 atoms at time t = 0. After 32 days you have 7.1x10 5 atoms of the radioactive nuclide left. (The rest has decayed). How much radioactive nuclide remains after an ADDITIONAL 32 days? Explain your reasoning/show work. 21. A sample of Arsenic-69 has a half-life of 15.1 minutes. Determine the decay constant for this isotope and then determine how many atoms would be left after three days if you start off with 5.4x10 42 atoms. 22. A sample of Plutonium-236 has a half-life of 2.9 years. Determine the decay constant for this isotope and then determine how many atoms would be left after 45 years if you start off with 58 kg. 23. A sample Iodine-132 has 6.02x10 23 atoms (a not so subtle hint that June 2 nd is one of two Mole Days each year) at a known point in time. After 150 hours you have 6.47x10 3 atoms of the radioactive nuclide left. (The rest has decayed). How much radioactive nuclide remains after an ADDITIONAL 8 hours? Explain your reasoning/show work.
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