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Concept explainers
Interpretation:
Number of half-lives that are elapsed has to be calculated from the given diagram where silicon-34 decays to phosphorus-34.
Concept Introduction:
Radioactive nuclides undergo disintegration by emission of radiation. All the radioactive nuclide do not undergo the decay at a same rate. Some decay rapidly and others decay very slowly. The nuclear stability can be quantitatively expressed by using the half-life.
The time required for half quantity of the radioactive substance to undergo decay is known as half-life. It is represented as
The equation that relates amount of decayed radioactive material, amount of undecayed radioactive material and the time elapsed can be given as,
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Chapter 11 Solutions
EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- Write the nuclear equation for the beta decay of Bi-214.arrow_forwardWrite the nuclear equation for the alpha decay of Po-214.arrow_forwardThe decay of an isotope element follows a first-order reaction. Assuming that you start with 964 mg of the isotope element sample, after 39.4 hours of decay, you find that there is 275 mg of the sample remaining. What is the half-life time of this reaction?arrow_forward
- The half-life of 1311 is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the decay constant for this isotope. s-1 (c) Convert 0.550 µCi to the SI unit the becquerel. |Bq (d) Find the number of 1311 nuclei necessary to produce a sample with an activity of 0.550 μCi. | 1311 nuclei (e) Suppose the activity of a certain 131I sample is 7.10 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.) half-lives mCiarrow_forwardFor Be-10, find the: a.) mase defect (in grams) b.) binding energy in kilojoules per mole. mass proton= 1.00728 amu; mass neutron= 1.00867 amu; mass Be-10 = 10.013534679 amuarrow_forwardAt the beginning of an experiment, a scientist has 268 grams of radioactive goo. After 180 minutes, her sample has decayed to 4.1875 grams.What is the half-life of the goo in minutes? Find a formula for G(t)G(t), the amount of goo remaining at time tt. How many grams of goo will remain after 32 minutes?arrow_forward
- Phosphorus-32, a radioisotope used in leukemia therapy, has a half-life of about 14 days. Approximately what percentage of a sample remains after eight weeks?arrow_forwardHow many half-lives would have to elapse for a sample of a radioactive isotope to decrease from an activity of 224 cpm to an activity of 7 cpm?arrow_forwardAssume that you list the following types of electromagnetic radiation in order of increasing wavelength: () the gamma rays produced by a radioactive nuclide used in medical imaging: (ii) radiation from an FM radio station at 93.1 MHz on the dial; (iii) a radio signal from an AM radio station at 680 kHz on the dial; (iv) the yellow light from sodium vapor streetlights; (v) the red light of a light-emitting diode. Which one would be the second? Lütfen birini seçin: O a 680 kHz AM radio waves O b. the red light O c the yellow light O d. 93.1 MHz FM radio waves O e the gamma raysarrow_forward
- Given a mixture of three proteins, A, B and C, with isoelectric points pIA = 4.2, pIB = 7.0 and pIC = 7.7, could you separate them using a single chromatographic run?arrow_forwardThe formation constants at 25°C for Fe(CN)4-6 and Fe(EDTA)2– are 1.00 x 1037 and 2.10 x 1014, respectively. Answer the questions below. 1) Calculate K under standard conditions for the reaction Fe(EDTA)2−(aq) + 6CN−(aq) ----> Fe(CN)4−6(aq) + EDTA4−(aq) 2) Calculate ΔG° for the reaction. (kJ/mol)arrow_forwardExplain how the type of decay, the half life and the chemical properties make the following radionuclides suitable for the given applications: A single gram of polonium will reach a temperature of 500°C making it useful as a source of heat for space equipment (α emitter, half lives of polonium isotopes range from less than a second to 200 years).arrow_forward
- Principles Of Radiographic Imaging: An Art And A ...Health & NutritionISBN:9781337711067Author:Richard R. Carlton, Arlene M. Adler, Vesna BalacPublisher:Cengage Learning
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