Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute?
Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after...
13) Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute? (6 points)
13) Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute? (6 points) 14) Photons of energy 6.0 J are incident on a metal. It is found that current flows until a stopping potential of 3.8 V is applied. A) Find the work function. (5 points) B) If the wavelength of incident photons is tripled, what is the maximum kinetic energy of ejected electrons? (5 points)
Problem 11: Beryllium-7 has a half-life of 53.1 days. What fraction of the nuclei in a beryllium sample will remain after 225 days? [If it will help, you can assume that 109 nuclei are present at the start] (6)
If carbon-14 has a decay half-life of 5730 years, what fraction of the original carbon-14 would you expect to remain intact in a 3000 year old parchment scroll, and why?
What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 2.1 yr ?
A) The half-life for the decay of fluorine-18 is 109.8 min. What percent of the initial amount of fluorine-18 will remain after 439.2 min? The decay of fluorine-18 is a first order reaction. B) The decay of carbon-14 is used to date objects related to human civilization. The decay has a half-life of approximately 5730 years. The book that "nobody can read" or the Voyich manuscript was dated by faculty at the University of Arizona. It was found that 93.0%...
91. If the half – life of a sample of radioactive material is 60 days, what fraction of the original radioactive nuclei will remain after 120 days.
You are given four different radioactive samples. Rank the samples in order of what fraction of the original nuclei remains after 1 hour (1 h = 3600 s), from largest fraction to smallest fraction. If any two samples have the same fraction remaining, state this. Explain how you made your ranking. (i) A sample of phosphorus-32 (32P), with a half-life of 1.235 × 106 s (ii) A sample of fluorine-18 (18F), with a half-life of 6.586 × 103 s (iii)...
If C14 has a half-life of 4,000 years, what fraction will be remaining after 36,000 years? IfI 131 has a half-life of 8 days, what fraction will be left after a year?
The Cs-131 nuclide has a half-life of 30 years. After 120 years, 8.7 g remain. What is the original mass of the Cs-131 sample?