Your lab has been given a radioactive sample and you determine that the decay constant is 3.00 x 10-6 s-1 and that the activity at that time is 56.0 µCi. You are then asked to determine the number of nuclei that will decay in the time interval between 5.00 and 7.00 hours after you received the sample.
Q: Part A A sample of U (T1=1.59 × 10° yr) contains 6.10 × 1018 nuclei. Part B Approximately how many…
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Q: λ =
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- Chromium's radioactive isotope 5'Cr has a half-life of 27.7 days and is often used in nuclear medicine as a diagnostic tracer in blood studies. Suppose a 5'Cr sample has an activity of 2.00 µCi when it is placed on a storage shelf. (a) How many 5'Cr nuclei does the sample contain? (b) Calculate the sample's activity in Bq when it is removed from storage one year later.An artifact classified as charcoal, found in a site at Epirus, Greece, is found to have a 14C radioactivity of 4.36×10-2 counts per second per gram of carbon. If living carbon-containing objects have an activity of 0.255 counts per second per gram of carbon, estimate the age of the artifact? The half-life of 14C is 5730 years.l The isotope 208Tl undergoes β decay with a half-life of 3.1 min. How many minutes will it take for a 200 g sample to decay to 12.5 g?
- A radioactive sample of 60Co (t₁/2 = 5.271 y) has a ß- activity of 4.4 X 107 Bq. How many grams of 60Co are present?U235 has a decay constant of 3.138 × 10-17 s-1. Activity of 1 µg of the sample will be 80.386×10-3 Bq. How many decays per second occur when the sample is one week old?a sample containing l-131 has an activity of 6.4x10^8 Bq.h how many days later will the sample have an activity of 6.2x10^6 Bq? the half life of l-131 is 8.0252 days
- A tree falls in a forest. How many years must pass before the C activity in 1.00 g of the tree's carbon drops to 1.00 decay per hour? (answer in ×10 y)Part L A 2.40 kg can of coffee moving at 1.50 m/s in the +x-direction on a kitchen counter collides head-on with a 1.20 kg box of macaroni that is initially at rest. After the collision the can of coffee is moving at 0.825 m/s in the +x-direction. What is the velocity (magnitude and direction) of the box of macaroni after the collision? Express your answer to three significant figures and include the appropriate units. Enter positive value if the box is moving in the +-direction and negative value if the box is moving in the -z-direction. μà C ? VB2 = Value Units Submit Request Answer Part M What is the kinetic energy of the can before the collision? Express your answer with the appropriate units. μA ? KC1 = Value Units Submit Request AnswerOn your birthday, you measure the activity of a sample of 210Bi, which has a half-life of 5.01 days. The activity you measure is 1.000 μCi. What is the activity of this sample on your next birthday? (a) 1.000 μCi (b) 0 (c) ~0.2 μCi (d) ~0.01 μCi (e) ~10-22 μCi
- SHOW WORKA sample of carbon of mass 6.74 g taken from an animal jawbone has an activity of 4.00 decays/min. How old is the jawbone in years?Part A A sample of U (T1 1.59 × 10° yr) contains 2 6.10 x 1018 nuclei. Part B Approximately how many disintegrations will occur per minute? Express your answer using three significant figures. nV ΑΣφ ? ΔΝ At decays/min