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Technetium-99m is widely used in medical imaging because it emits gamma rays but has a short half-life. Explain why having a short half-life is an advantage in medicine. Why are gamma rays particularly useful for diagnostic imaging compared to alpha or beta radiation?  

Street Signs are shops all rely on neon lights to catch attention. Different gases in discharge tubes used for the lights emit different colors when an electric current passes through them. a) Explain, in terms of electronic structure, why each gas produces its own unique emission spectrum. (4 points) b) A neon sign emits bright red-orange light with a dominant wavelength of ~ 640 nm. Calculate the energy (in joules) of a single photon of this light. ( 4 points) Use h=6.626×10−34 J⋅sh = 6.626 \times 10^{-34} \, J \cdot s        c=3.00×108 m/sc = 3.00 \times 10^{8} \, m/s *make sure to show all your work – giving only the answer or irrelevant work will earn a zero grade. 

The MSN-prepared RN understands that the following statements are true regarding the Beers Criteria (Select all that apply): 

A woman who is breastfeeding her infant asks what over the counter (OTC) medication she can use for headaches while she is nursing. The Master’s-prepared registered nurse tells her:

What is the energy of a photon with a frequency of 6.0×1014 s−16.0 \times 10^{14}\,\text{s}^{-1}? Use h=6.626×10−34 Jsh = 6.626 \times 10^{-34} \text{ J·s}

Phosphorus-32   is used in the treatment of leukemia, among other things. The isotope undergoes beta particle decay. Write a balanced equation for this process. Be sure to include all missing information including: symbol, mass number, and atomic number. *use the symbol to help you create the equation. –Insert–> equation–>basic–>8th symbol in. *If you can’t figure out the symbol, do your best to create the balanced equation. example:   Al  + He–>

The metric prefix “milli-” means ___________.

A patient weighs 154 lbs. Convert this weight to kilograms. (1 kg = 2.205 lbs)   *answer in correct significant figures

A radio station broadcasts at a frequency of 100.3 MHz (megahertz). Calculate the wavelength of the radio waves in meters.    E=hcλ c=λ* vE = \frac{hc}{\lambda} h=6.626×10−34J⋅sh = 6.626 \times 10^{-34} J·s c=3.00×108m/sc = 3.00 \times 10^8 m/s 1MHz=1×106Hz * Final answer should be in correct significant figures and include proper unit. 

Which of the following best explains why helium is used in balloons instead of hydrogen?