Assume the half life of some radioactive element is 100 years. After 300 years have gone by, how much of the original radioactive element is left? O 1/2 O 1/4 1/8 O1/16
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- If an element has a half life of 12 years, how many years must elapse until 87.5% of the original material has decayed? Group of answer choices 24 yrs 12 yrs 60 yrs 48 yrs 6 yrs6. If Nitrogen-14 absorbs an alpha particle and then emits a Hydrogen-1, what is the resulting nucleus? 7. If Au-185 emits an alpha particle, what is the nucleus formed? 8. What nucleus emits an alpha particle and forms Th-234?Q3: The table shows two isotopes of potassium and two isotopes of calcium. Type of emission Mass of neutral atom / u Number of electrons Number of protons Number of neutrons Total mass/u Mass defect/ u Binding energy / J Mass of the electron = 0.000549 u Mass of the proton = 1.007276 u Mass of the neutron = 1.008665 u TI ***** LEG 39K Stable 38.96371 SE nda 42K ß decay a) Use data about potassium-42 to explain the concept of mass defect. 3000 41.9624 19 19 23 42.34797 0.38557 5.76 x 10-11 De RAP 39 Ca ßt decay 38.9707 440 **** ****** D 42 Ca stable 41.95863
- The half-life of a radioactive isotope is 6.02 hours. 25.0 Grams of this isotope is needed for an experiment. How many grams of the isotope must be ordered if 48 hours pass between the time the isotope is ordered and the start of the experiment?A nuclear/ radioactive decay may be best expressed as ON= N₂ ext ON= N₂ e-1/At ON = No et, where the symbols have their own significances O N₂ = NextIf an isotope with 7 proton and 8 neutrons were to fuse with another isotope with five protons and five neutrons and then the resulting compound nucleus were to emit an alpha particle which of the following would be the shorthand description of the final nucleus?