Question

5. A Geiger counter measures the activity of a sample of a particular radioisotope to be...

5. A Geiger counter measures the activity of a sample of a particular radioisotope to be 6400 counts per minute. Four hours later, the counter measures 25 counts per minute for the same sample.

a. What is the half-life of the sample?

b. Is this sample likely to be dangerous for a long period of time? Why?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1


0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
You are using a Geiger counter to measure the activity of a radioactive substance over the...
You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 63.6 minutes , what is the half-life of this substance?
You are using a Geiger counter to measure the activity of a radioactive substance over the...
You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 37.8 minutes , what is the half-life of this substance?
Part A You are using a Geiger counter to measure the activity of a radioactive substance...
Part A You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 78.4 minutes , what is the half-life of this substance? Express your answer with the appropriate units. Part B An unknown radioactive substance has a half-life of 3.20 hours . If 26.8 g of the substance is currently present, what mass A0 was present 8.00 hours...
You are using a Geiger counter to measure the activity of a radioactive substance over the...
You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 54.3 minutes , what is the half-life of this substance? Express your answer with the appropriate units. t1/2 = 27.2 min Correct Part B An unknown radioactive substance has a half-life of 3.20 hours . If 20.6 g of the substance is currently present, what mass A0 was...
echnetium in the Body. As mentioned in a previous problem, Tc-99m is a common radioisotope used...
echnetium in the Body. As mentioned in a previous problem, Tc-99m is a common radioisotope used in medical imaging. It is a metastable isotope that emits low energy gamma radiation (140 keV) with a half-life of roughly 6 hours. This half-life is extremely long for a metastable state, which makes it useful for studying gamma emission. This particular radioisotope has a biological half-life of roughly 1 day while in a human, and an atomic mass of 1.627 ×× 10−25−25 kg/atom....
Technetium in the Body. As mentioned in a previous problem, Tc-99m is a common radioisotope used...
Technetium in the Body. As mentioned in a previous problem, Tc-99m is a common radioisotope used in medical imaging. It is a metastable isotope that emits low energy gamma radiation (140 keV) with a half-life of roughly 6 hours. This half-life is extremely long for a metastable state, which makes it useful for studying gamma emission. This particular radioisotope has a biological half-life of roughly 1 day while in a human, and an atomic mass of 1.627 ×× 10−25−25 kg/atom....
1. Suppose that you are given a 200 gram sample of a radioactive substance with a...
1. Suppose that you are given a 200 gram sample of a radioactive substance with a half-life of 45 days. How many grams will be left after 360 days? 2. A radioactive substance is found to register 5000 counts per second on a Geiger counter. Twenty-four hours later it registers 1250 counts per second. What is its half-life? 3. If a sample emits 2000 counts per second when the detector is 1 meter from the sample, how many counts per...
A radiation counter measures 2.85 x 103 counts s-1 at 9:10 a.m. on Tuesday. In the...
A radiation counter measures 2.85 x 103 counts s-1 at 9:10 a.m. on Tuesday. In the afternoon, at 13:27, it measures 2.23 x 103 counts s-1. (a). What is the value of the decay constant, in min-1 and in s-1 ? (b). Determine the half life, in minutes. (c). At what day and time will the countrate reach 285 counts s-1 ? (d). Assume that the countrate reported by your instrument is 80.0% of the true decay rate of the...
The half-life of 60Co is 5.27 years. The activity of a 60Co sample is 0.0946 µCi....
The half-life of 60Co is 5.27 years. The activity of a 60Co sample is 0.0946 µCi. (a) What is the mass of the sample? (b) What is the activity of the sample after 20 years? (c) If background readings in the lab are ∼ 45 counts per minute, should we keep that 60Co disk or throw it away?
In a study on the physical activity of young​ adults, pediatric researchers measured overall physical activity...
In a study on the physical activity of young​ adults, pediatric researchers measured overall physical activity as the total number of registered movements​ (counts) over a period of time and then computed the number of counts per minute​ (cpm) for each subject. The study revealed that the overall physical activity of obese young adults has a mean of μ=320 cpm and a standard deviation of σ=90 cpm. In a random sample of 100 obese young​ adults, consider the sample mean...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT