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...
Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute?
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?
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%...
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)...
What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 2.1 yr ?
Nitrogen 13 has 7 protons and a half life of 600 seconds. What is the activity in Ci after 88.367 minutes? The initial mass of the nitrogen 13 is 93.633 micrograms. The mass of N13 is 13.005799 g/mole.
The half-life of nitrogen-13 is approximately 9.97 minutes. How much of a 3 gram sample of nitrogen-13 would remain after 8 minutes? Round to three decimal places
Radioactive Decay - Half-life and Activity 1 Radioactive decay - Half-life Time 0 1000 21 31 750 N 1.000.000 500,000 250,000 125,000 62,500 31.250 15.625 7813 3.506 1.953 977 51 6 500 7 BI . 101 250 125 0 tie 21.234.41516171819, 1012 Time in multiples of A radioactive sample's half-life is 30.2 years. 1 year = 365 days, 1 day = 24 hours, 1 hour - 60 minutes, 1 minute = 60 seconds (a) Find its decay constant in year...