The half-life of is 0.1452 years. The surface of the Earth gets frequently bombarded by this isotope...

The half-life of is 0.1452 years. The surface of the Earth gets frequently bombarded by this isotope which is generated in the atmosphere. In an oleander twig, is observed to decay at a 350 decays/s decay rate.
(a) How long will it take until the decay rate drops to 25 decays/s?
(b) What is the initial mass of present on the oleander twig?

Molar mass of is 7.017 g/mol.

Expert Solution

genius_generous answered 2 years ago

The half-life of a certain radioactive isotope is 3.24 years. If a sample consisting of 6.023x1023...

The half-life of a certain radioactive isotope is 3.24 years. If a sample consisting of 6.023x1023 atoms were allowed to decay, what percentage of the original number of atoms have decayed after 2.0 years? A) 50 B) 46 C) 32 D) 54 E) 60

The Plutonium isotope 239Pu has a half-life of 24,000 years and decays by the emission of...

The Plutonium isotope 239Pu has a half-life of 24,000 years and decays by the emission of a 5.2 MeV alpha particle. Plutonium is not especially dangerous if handled because the activity is low, and the alpha radiation doesn’t penetrate the skin. However, there can be serious health concerns if the tiniest particles are inhaled and lodge deep in the lungs. This could happen following any kind of fire or explosion that disperses Plutonium as dust. a) (3 pts.) Soot particles...

he isotope 81Thallium204 has a half-life of 3.78 years and can be used as a nanotechnology...

he isotope 81Thallium204 has a half-life of 3.78 years and can be used as a nanotechnology MEMS (Micro Electric Mechanical System) power source device. It decays through beta emission into 82Pb204 with a branching ratio of 97.1 percent with an average decay energy of 0.764 MeV. It also decays through electron capture to 80Hg204 with a branching ratio of 2.9 percent with a decay energy of 0.347 MeV. Calculate the energy release per decay event in [MeV/disintegration] Calculate its total...

The half-life of a radioactive isotope represents the average time it would take half of a...

The half-life of a radioactive isotope represents the average time it would take half of a collection of this type of nucleus to decay. For example, you start with a sample of 1000 Oxygen-15 (15O) nuclei, which has a half-life of 122 seconds. After 122 seconds, half of the 15O nuclei will have decayed into Nitrogen-15 (15N) nuclei. After another 122s, half of the remaining Oxygen nuclei will have also decayed, and so on. Suppose you start with 3.71×10315O nuclei...

The common isotope of uranium, 238U, has a half-life of 4.47×109 years, decaying to 234Th by...

The common isotope of uranium, 238U, has a half-life of 4.47×109 years, decaying to 234Th by alpha emission. Part A: What is the decay constant? Express your answer in inverse seconds to three significant figures Part B: What mass of uranium is required for an activity of 2.00 curie? Express your answer in kilograms to three significant figures. Part C: How many alpha particles are emitted per second by 11.0 g of uranium? Express your answer in decays per second...

Carbon 14 (C-14), a radioactive isotope of carbon, has a half-life of 5730 ± 40 years....

Carbon 14 (C-14), a radioactive isotope of carbon, has a half-life of 5730 ± 40 years. Measuring the amount of this isotope left in the remains of animals and plants is how anthropologists determine the age of samples. Example: The skeletal remains of the so-called Pittsburgh Man, unearthed in Pennsylvania, had lost 82% of the C-14 they originally contained. Determine the approximate age of the bones assuming a half-life of 5730. (a) 14,000 years (b) 15,000 years (c) 17,000 years...

The half life of an isotope is 20 minutes. After 2.00 hours, 0.10 grams of the...

The half life of an isotope is 20 minutes. After 2.00 hours, 0.10 grams of the sample remains. how many grams was in the original sample.?

32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 30.9...

32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 30.9 g of 32P, how much 32P was present 9.00 days ago?

If there is 10umol of the radioactive isotope 32P (half-life 14 days) at t=0, how much...

If there is 10umol of the radioactive isotope 32P (half-life 14 days) at t=0, how much 32P will remain at (a). 7 days (b) 14 days (c) 21 days and (d) 70 days? I already know the answers, I have the student companion guide to my biochemistry textbook. It does not tell me how to work out the problem though. If anyone could help it would be appreciated! The answers are (a) 7mmol (b) 5umol (c) 3.5mmol and (d) 0.3umol

The isotope 198 79 Au (atomic mass = 197.968 u) of gold has a half-life of...

The isotope 198 79 Au (atomic mass = 197.968 u) of gold has a half-life of 2.69 days and is used in cancer therapy. What mass (in grams) of this isotope is required to produce an activity of 308 Ci?

Question