If the half-life of a radioisotope is 2 days, after how many days is the quantity reduced to 12.5% of its original amount?

Q: A certain radio active substance has half-life of 38 hours. The value of k is 0.01823684211 and it…

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Q: What is the relationship between decay constant and mean life of a radioactive nucleus?

A: The mean life of a radioactive nucleus is calculated by using the formula τ=1λ , where λ is the…

Q: Suppose the decay constant of radioactive substance A is twice the decay constant of radioactive…

A: Given: Decay constant of A = 2× decay constant of B Half-life of B = 3 h.

Q: A small region of a cancer patient’s brain is exposed for 24.0 min to 475 Bq of radioactivity from…

A: Given data: Time t=24 min =1440seconds Emission rate =475 Bq Amount of dose =1.858g=0.001 Energy E=…

Q: A sample of a particular radioisotope is placed near a Geiger counter, which is observed to register…

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Q: Which of the following is a form of natural radioactivity that would be deflected by a magnetic…

A: Anything that contains charge will experience magnetic force when it passes magnetic field. X rays…

Q: what is the difference between radioactivity and decay?

A: The difference between Radioactivity and Decay is as follows -  Radioactivity - Radioactivity means…

Q: The half-life of americium-241 is 457 years. What is the activity in curies of a 0.010g of sample of…

A: Half life of americium 241  t1/2 = 457 years Mass of sample m = 0.010 g Molar mass of americium -241…

Q: Calculate the mass defect and the binding energy of the deuterium

A: We know: Mass of hydrogen, MH=1.007941 amu Mass of proton, MP=1.007941 amu Mass of neutron,…

Q: What is a radioactive tracer?

A: Radiactive tracer: The tracer is used to detect the radioactive particle in any kind of mechanism.…

Q: Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the…

A: The radioactivity decay of a sample has a relationship given by:Nt=N0e-λt………(1)where,N0 is the total…

Q: A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope.…

A: A Geiger counter registers a count rate of N0 = 8000 per minute. After time t = 10 minutes, the…

Q: What mass of a 2,400g sample of an isotope will remain after 32.8 days if the half life of the…

A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,…

Q: A Geiger counter registers a count rate of 7,200 counts per minute from a sample of a radioisotope.…

A: Given: A Geiger counter registers a count rate of 7,200 counts per minute from a sample of a…

Q: A Geiger counter registers a count rate of 4,800 counts per minute from a sample of a radioisotope.…

A: Given data:  Initial count rate (N0) = 4,800 counts per minute Time (t) = 10 minutes Remaining count…

Q: After two half-lives of radioactivity amount of radioactive atoms remaining is none O N/2 N/4 O N/8

A: Given data: Number of half-lives (n) = 2 Required: Remaining amount after 2 half-lives

Q: A Geiger counter registerss a count rate of 6,800 counts per minute from a sample of a radioisotope.…

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Q: Two nuclei have mass numbers in the ratio 2 : 5. What is the ratio of their nuclear densities?

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Q: Two common units for measuring radioactivity are the Becquerel and the curie. Why are these names…

A: Radioactivity is the phenomenon when a large nucleus splits into a small nucleus.

Q: What is the half-life of a radioactive isotope if the activity of a sample drops from 14,080 cpm to…

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Q: 4. (1.17) A scan is taken for a patient, and an area of radioactivity is found. The sinogram is…

A: The figure shown below is a scan taken for a patient, and an area of radioactivity is found,

Q: A Geiger counter reading of a radioactive sample is initially 7020 counts per minute. The same…

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Q: Tritium (half-life = 12.3 yr) is used to verify the age of expensive brandies. If an old brandy…

A: The amount remaining is equal to the original amount times 1/2 raised to the of half-lives that have…

Q: Geiger counter reading of a radioactive sample is initially 6520 counts per minute. The same sample…

A: Given:Initial count rate, N0 =6520 count/minFinal count rate, N = 422 count/mintime, t = 10.1 hr

Q: If the half-life of actinium-227 is 21.8 years, approximately how much time will be required to…

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Q: what is the specific difference between radioactivity and radioactive decay?

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Q: A Geiger counter reading of a radioactive sample is initially 6520 counts per minute. The same…

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Q: If Th-234 emits a beta particle, what nucleus is formed?

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Q: If a 1.50-cm-thick piece of lead can absorb 90.0% of the γ rays from a radioactive source, how many…

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Q: A drug tagged with Tc (half-life = 6.05 h) is prepared for a patient. If the original activity of…

A: GivenHalf life (T1/2)=6.05 hActivity of sample (A0)=1.5×104   Bq

Q: A radiation worker stands 10 cm away from a radioactive source of 55 mCi 57Co. Calculate the…

A: It is given that,

Q: A Geiger counter reading of a radioactive sample is initially 7420 counts per minute. The same…

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Q: Tritium (half-life = 12.3 yr) is used to verify the age of expensive brandies. If an old brandy…

A: N/N0 = (1/2)n  N = total time / T1/2

Q: Find the activity of a sample containing 1.63 10-6 g of (60/27)Co (T1/2 = 5.27 years).

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Q: How many radioactive nuclides are in a sample with a radioactivity of 3.1 kCi? The half-life of the…

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Q: What characteristics of radioactivity show it to be nuclear in origin and not atomic?

A: Radioactivity is a type of process in which there is an emission of the particle from unstable…

Q: What isotope is produced when Np-239 emits a beta particle?

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Q: Carbon 14 activity of 130 gram sample of wood. Bq is 2.22. How old is sample in years?

A: Given information: The amount of wood is, m=130 g=0.130 kg The activity of carbon 14 is, A=2.22 Bq

Q: A Geiger counter registers a count rate of 5,600 counts per minute from a sample of a radioisotope.…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: 3.  If a sample emits 2000 counts per second when the detector is 1 meter from the sample, how many…

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Q: Technetium-99m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally…

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Q: A radioactive isotope has a half-life of 10 minutes. At the start of an experiment, the activity of…

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Q: Radioactivity depends on the nucleus and not the atom or its chemical state. Why, then, is one…

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Q: Find the activity of a sample containing 6.92 x10-6 g of  (T1/2 = 5.27 years).

A: Total sample,N=6.92*10-6 g. T½=5.27 years.

Q: radiopharmaceutical is labeled with an activity of 480 mCi on April 1 at 6:00am. What is the…

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Q: A Geiger  counter registers a count rate of 8000 counts per minute from a sample of a radioisotope.…

A: count rate at t=0 is Ao =8000 counts/min count rate at t=24 is A=1000 counts /min

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.