Question

An unknown radioactive element decays into non-radioactive substances. In 860 days the radioactivity of a sample...

An unknown radioactive element decays into non-radioactive substances. In 860 days the radioactivity of a sample decreases by 54 percent.

(a) What is the half-life of the element?
half-life: (days)

(b) How long will it take for a sample of 100 mg to decay to 91 mg?
time needed: (days)

Math   Calculus   
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
An unknown radioactive element decays into non-radioactive substances. In 860 days the radioactivity of a sample...
An unknown radioactive element decays into non-radioactive substances. In 860 days the radioactivity of a sample decreases by 49 percent. (a) What is the half-life of the element? half-life:   (days) b) How long will it take for a sample of 100 mg to decay to 78 mg? time needed:  (days)
An unknown radioactive element decays into non-radioactive substances. In 520 days the radioactivity of a sample...
An unknown radioactive element decays into non-radioactive substances. In 520 days the radioactivity of a sample decreases by 35 percent. (a) What is the half-life of the element? (days) (b) How long will it take for a sample of 100 mg to decay to 44 mg? time needed: (days)
(1 point) An unknown radioactive element decays into non-radioactive substances. In 500 days the radioactivity of...
(1 point) An unknown radioactive element decays into non-radioactive substances. In 500 days the radioactivity of a sample decreases by 39 percent. (a) What is the half-life of the element? half-life:  (days) (b) How long will it take for a sample of 100 mg to decay to 57 mg? time needed:  (days)
An unknown radioactive element decays into non-radioactive substances. In 640 days the radioactivity of a sample...
An unknown radioactive element decays into non-radioactive substances. In 640 days the radioactivity of a sample decreases by 50 percent. What is the half-life of the element? How long will it take for a sample of 100 mg to decay to 70 mg?
A sample of a certain radioactive material decays to 89.36% of its mass after 2 years....
A sample of a certain radioactive material decays to 89.36% of its mass after 2 years. a. What is the half-life of the material? Show your calculations and keep four significant figures of accuracy. b. How long would it take for the sample to decay to 10% of its original mass? How much longer after that would it take to decay to 1% of its original mass?
The radioactive isotope 32P decays by first-order kinetics and has a half-life = 14.3 days. How...
The radioactive isotope 32P decays by first-order kinetics and has a half-life = 14.3 days. How many atoms of a 1.0000 ug sample of 32P would decay in 1.0000 second? (Assume 1 decay per atom.)
The radioactive decay of I-131 is first order with a half life of 8.02 days. How...
The radioactive decay of I-131 is first order with a half life of 8.02 days. How long will it take for 80% of a sample to decay? The answer is 19 days. I need help working it out to get that answer. Thank you in advance.
You have a 9.8 mol pure sample of an unknown material. After 1.3 h, you discover...
You have a 9.8 mol pure sample of an unknown material. After 1.3 h, you discover that 22% has decayed. Determine the half-life, decay constant, mean life, & initial decay rate. Also determine what the decay rate is at 1.3 h. T1/2 = λ = ________ h-1 τ = Ro = __________ decays/h R = __________ decays/h The decay rate of a radioactive source decreases by 70.6% in 6 h. Determine the half-life, decay constant, & mean life of the...
Plutonium-239 can be used to make nuclear weapons and is found in nuclear waste, but radioactive...
Plutonium-239 can be used to make nuclear weapons and is found in nuclear waste, but radioactive waste from nuclear reactors contains large amounts of undesirable contaminants. Radioactive waste can be stored in deep geological storage. Over many years the fission products decay, decreasing the radioactivity of the waste. However, the undesirable contaminant Pu-240 decays faster than the Pu-239, and thus the quality of the bomb material increases with time. In order for weapons grade plutonium to be obtained the sample...
A radioactive substance decays at a continuous rate of 8.6% per day. After 15 days, what...
A radioactive substance decays at a continuous rate of 8.6% per day. After 15 days, what amount of the substance will be left if you started with 100 mg? (a) First write the rate of decay in decimal form. r= (b) Now calculate the remaining amount of the substance. Round your answer to two decimal places
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT