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Photons are the tiniest packets of electromagnetic energy and it includes light or radio waves. It travels at the speed of light.
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- Which of the following types of photons (packets of pure electromagnetic energy) have the highest energy level? visible light infrared microwaves ultra-violetIn a vacuum, all electromagnetic waves have the same speed. frequency O wavelength. O amplitude.Given the chromatogram below in a normal phase, which samples would be the most polar? A O Samples Cand D O Samples B and X O Samples B and C O Samples A and D
- The patlents described In the table below just checked in to the Alex Py Memorlal Hospital & Regional Medical Center. Which are headed to the Department of Nuclear Medicine for a radioimaging procedure? Which are headed to the same place for a brachytherapy procedure? procedure patlent O brachytherapy Rachel is taking part in a research study almed at understanding how the brain recovers from a stroke. Today she is scheduled for a PET (Positron Emission Tomography) scan that will map out the blood flow through her brain so it can be compared to the result of PET scans taken earlier in her recovery. O radioimaging O neither O brachytherapy Kelsha is being treated for cervical cancer. After surgery to remove the tumor, her oncologist recommended the placement of radioactive iridium-192 wires near the tumor site to kill any remaining cancer cells, for 15 minutes at time, 2 days a week, for 4 weeks. Today she arrives for her final treatment session. O radioimaging O neither O brachytherapy…Which of the following method is employed in the sample preparation for the cryo-electron microscope? O The sample is flash-frozen in water to form crystalline ice O The sample is embedded, sectioned and then stained with a negative stain then flash-frozen in water to form vitreous or amorphous ice The sample is flash-frozen in water to form vitreous or amorphous ice The sample is embedded, sectioned and then stained with a negative stain then flash-frozen in water to form crystalline iceplease wich type of x rays could reach inside human body (ie lungs)the energy of 5 mJ/cm2 preferably wavelenght of 150 nm approx and time exposure necessary to reach this level is this energy it in the range of usual x rays used in medicine for diagnosis or therapy ?
- Which factor makes the biggest difference when studying the effects of radiation on an organism? O the number of cells exposed to the radiation the frequency of the radiation O the size of the organism O the duration of exposureon Select the correct statement from the following option: O a. Spectroscopic methods require less time and more amount of sample than classical methods O b. Spectroscopic methods require more time and more amount of sample than classical methods cof O c. Spectroscopic methods require less time and less amount of sample than classical methods O d. The results obtained by spectroscopic methods are less rellable, less reproducible and incorrect than classical methods O . Spectroscopic methods require more time and less amount of sample than classical methodsA solution containing two different fluorescent compounds, Ben and Jerry, were analyzed for their individual concentrations in the mixture. Standards of pure Ben and pure Jerry were prepared at a concentration of 500.0 mM and were run in a UV-Vis Spectrophotometer to determine their absorption properties. Absorbance Wavelength Compound Ben 500 mM Compound Jerry 500 mM 400 nm 0.137 0.136 450 nm 0.312 0.113 500 nm 0.154 0.078 550 nm 0.076 0.079 600 nm 0.227 0.148 650 nm 0.230 0.230 700 nm 0.151 0.357 750 nm 0.157 0.246 800 nm 0.154 0.154 A standard curve of the standards was also prepared to help determine the concentration of each component in the solution. The solution produced an absorbance reading of 0.486 at the Amax of Ben, and 0.463 at the Amax of Jerry. STD CURVE BEN Amax Ben Amax Jerry STD CURVE JERRY Amax Ben Amax Jerry CONC (mM) ABS ABS CONC (mM) ABS ABS 100 0.074 0.025 100 0.037 0.074 200 0.148 0.057 200 0.081 0.148 400 0.284 0.103 400 0.164 0.284 800 0.607 0.218 800 0.287…
- Polonium is a rare element with 33 radioisotopes. The most common one, P210o, has 84 protons and 126 neutrons. When P210o decays, it emits an alpha particle, which is a helium nucleus 2 protons and 2 neutrons. P210o decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason why authorities failed to discover toxic amounts of P210o in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of P210o change into after it emits an alpha particle.A chemistry student at GGC synthesized a new sulfonamide (S7) drug to help treat malaria. Using a spectrophotometer the student observed that S7 converts to a colorless molecule in the presence of malaria parasite called Plasmodium falciparum. To study the rate of reaction, the student recorded the absorbance/amount of S7 at a wavelength of 570 nm. The results are summarized in the table below: Time (s) Absorbance/Amount of S7 0.80 0.63 10 0.50 15 0.40 20 О.32 25 0.25 30 0.20 Determine the half-life of S7. Include units in your answer MacBook Air 000 000 F8 80 F7Imagine you are using a microscope with 5x eye pieces (instead of 10x like ours). If you change from the 10x objective lens to the 40x objective lens, how does the total magnification change? O it is 30 units stronger O it is 4 times weaker with the 40x it is 5 times weaker with the 40x it is 30 units weaker O it is 5 times stronger with the 40x O it is 4 times stronger with the 40x 99+ 近