Problem 11: Beryllium-7 has a half-life of 53.1 days. What fraction of the nuclei in a...
13) Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute? (6 points)
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.
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)
The isotope 143Pr undergoes beta decay with a half-life of 13.57 days. What fraction of 143Pr has decayed after 11.6 days?
Suppose you start with a sample with 2.900×108 nuclei of a particular isotope. This isotope has a half-life of 374 s. a) What is the decay constant for this particular isotope? b) How many nuclei remain after 797 s? c) What is the activity of the sample at the beginning of the experiment?
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?
a radioactive sample has a half life of 10s if 20,000 nuclei are present at t=10s how many nuclei will be there at t = 40 s
PCO) = db) 1 CORRI The half-life of Palladium-100 is 4 days. After 12 days a sample of Palladium-100 has been reduced to a mass of 3 mg. What was the initial mass ſin mgl of the sample? What is the mass 6 weeks after the start? Question Help: D video Video Message instructor D Post to forum Submit Question Type here to search o G $
Consider a 15.60g sample of 131I, which has a half-life of 8.02 days. a. How much of the sample (in grams) will remain after 16.04 days? b. How much of the sample will remain after 16.04 hours?