Question

(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)

Math   Advanced-Math   
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 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)
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)
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?
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.)
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 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.
Q.1 Radioactive 68Ge decays by β+ with a 271 day half-life. How many grams of an...
Q.1 Radioactive 68Ge decays by β+ with a 271 day half-life. How many grams of an initial 2.50 g sample of 68Ge remain after 365 days of radioactive decay? Q.2 A particular reaction has an initial concentration of 4.302 M and a final concentration of 3.978 M after 1.08 seconds. The rate constant is 0.0175 M-1s-1. What is the half-life at the initial concentration?
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...
Radioactive Half-life Years Element A Remaining Radioactive Atoms Element B Remaining Radioactive Atoms Element C Remaining...
Radioactive Half-life Years Element A Remaining Radioactive Atoms Element B Remaining Radioactive Atoms Element C Remaining Radioactive Atoms Element D remaining Radioactive Atoms 0              100 100 100 100 1000 50 85 90 95 2000 25 72 81 90 3000 13 61 73 86 4000 6 52 66 81 5000 3 44 59 77 6000 2 38 53 74 7000 1 32 48 70 8000 0 27 43 66 9000 0 23 39 63 10000 0 20 35 60 11000...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT