Answers are given in bold letters.
1. What is the energy in eV of the electron of a hydrogen atom for the orbit designated n = 3? eV Energy = -13.6/n2 = -13.6/32 = -1.511eV 2. Photons of a certain ultraviolet light have an energy of 6.83 10-19 J. (a) What is the frequency of this UV light?_
1.0307*1015Hz (b) Use λ= c/f to calculate its wavelength in nm.
291nm 3. Use table to determine the energy in eV of the photon absorbed when an electron jumps down from the n = 4 orbit to the n = 1 orbit of a hydrogen atom.
10.2eV 4. What is the radius in nm of the electron orbit of a hydrogen atom for n = 3?____nm? 9a0 = 0.4761nm 5. Calculate the de Broglie wavelength of a 0.58 kg ball moving with a constant velocity of 26 m/s (about 60 mi/h). ____m? Wave length = h/(mv) = 4.393*10-15m 6.What is the de Broglie wavelength for Saturn (m = 5.69 1026 kg) as it moves in its orbit with a speed of 9.60 103 m/s? m ? 1.213*10-64m 7.The human eye is sensitive to orange light having a frequency of about 4.95 1014 Hz (a wavelength of about 608 nm). What is the energy in joules of the photons associated with this light? _____J Energy = hf = 6.626*10-34*4.95*1014 = 3.28*10-19J 8. Pick the radionuclide in each set. The atomic number and atomic are not clearly written. a) 227 28 89Ac 14Si b) 237 Np 20Ne 89Ac 14 Si c) 10B 70Ga 5 31 Explain your choice. its atomic number is XXXXX than 83? it has fewer n than p in the nucleus? it is an odd-odd nuclide? none of the above? The question is not clear. I think it should be U235. 9. Fill in the nine gaps in this table. Symbol Be Protons 8 Neutrons 8 Electrons 10 Mass number 9 20 Table is required 10. Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half-lives would go by in 40. h? ____half-lives? 6.67 half lives 11. A clinical technician finds that the activity of a sodium-24 sample is 480 cpm. What will the activity of the sample 30 h later if the half-life of sodium-24 is 15 h? ___cpm? 120cpm 12 Use the graph to find how long it would take the original sample of radionuclide A to decrease to 12 g.____d ? ￼ Graph is required. 13. A thyroid cancer patient is given a dosage of 131I (half-life = 8.1 d). What fraction of the dosage of 131I will still be in the patient's thyroid after 40.5 days?
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Calculate the de Broglie wavelength of a 0.58 kg ball moving with a constant velocity of 26 m/s (about 60 mi/h). __m?
determine the energy in eV of the photon absorbed when an electron jumps down from the n = 4 orbit to the n = 1 orbit of a hydrogen atom ___ev?