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Radioactive Decay
Page 5
Questions (597)
A rock containing a newly discovered fossil is found to contain 5 mg of an unstable form of potassium and 5 mg of the stable
4 answers
asked by
Janey
734 views
How long will it take 200 mg of carbon-14 to decay to the point where only 75 mg remain if the half-life is 5770 years?
3 answers
asked by
jordan
430 views
What can scientists learn from the rate at which radioactive elements decay?
A. a rock's absolute age* B. the relative age of
4 answers
asked by
Anonymous
1,136 views
if your smoke detector contains 0.10 mg of 241Am, how long will it take to decay 1.25 * 10^-2mg
2 answers
asked by
Mel
881 views
60.0 grams of Th-210 with a half life of 50,000 years is allowed to decay for 250,000 years. How much of the original quantity
2 answers
asked by
c
1,105 views
If an Elements has a half life of 20mins what is the radioactive decay of a 200gram sample?
1 answer
asked by
Half life
297 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×10^11 years longer. What is the
3 answers
asked by
Treetard
39 views
The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second.
WHat is the mass of
1 answer
asked by
Leila
321 views
A 14 gram sample of a substance that's used to preserve fruit and vegetables has a k-value of 0.1092. Find the substance's
1 answer
asked by
Tristan
678 views
The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second.
WHat is the mass of
1 answer
asked by
Leila
426 views
The activity of a sample of 35(upper#) 16(lower#)Sulfer (T 1/2= 7.55x10^6 s) is 2.51x10^5 decays per second.
WHat is the mass of
1 answer
asked by
Leila
317 views
Use this paragraph: The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is
3 answers
asked anonymously
99 views
Use this paragraph: The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is
3 answers
asked by
AVFUYVSDGHDF
222 views
The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is alive.
How many grams of
3 answers
asked by
help
45 views
sodium-24 has a half life of 15 hours,how much of a 50 gram sample will be left after 60 hours
2 answers
asked by
sue moore
608 views
A radioactive isotope, used in the agricultural industry has a half life of 8 days. On application, the radiation is emitted is
7 answers
asked by
Manu
450 views
what would be the chart to use for carbon 14 whcih has a half life of 5730 years and a piece of wood which originally has 12
1 answer
asked by
lan
906 views
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
1 answer
asked by
lan
389 views
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
2 answers
asked by
lan
1,014 views
if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days
2 answers
asked by
lan
515 views
In a tracer method the potassium isotope 42K is used for labelling. The half life of 42K is 12.5 hours. If No is original number
3 answers
asked by
Kyle
427 views
It takes 1 hour and 17 min. for a 1.000gsample of a certain isotope to decay to 0.121g. What is the half-life of this isotope?
1 answer
asked by
Shay
373 views
suppose you have a 150 gram sample of radioactive decay god-191 which has a half- life of 3.4 hours. how many grams of gold will
3 answers
asked by
Maria
480 views
The half-life for the process 238U 206Pb is 4.5 109 yr. A mineral sample contains 45.9 mg of 238U and 16.8 mg of 206Pb. What is
4 answers
asked by
sara
1,317 views
2. An isotope of sodium has a half-life of 15 h. A sample of this isotope has a mass of 2 g.
a. [2] Find the mass equation that
2 answers
asked by
kim
502 views
An artifact was found and tested for its carbon-14 content. If 70% of the original carbon-14 was still present, what is its
2 answers
asked by
Randy
920 views
If you started with 100 grams of Potassium-40 how much would reamin Potassium-40 after 3.9 x 10 to the 9th years?
3 answers
asked by
Donna
367 views
half life carbon -14 is 5,730 years. If you start out 50 grams, how long will it take until it reaches 2 grams?
2 answers
asked by
chels
527 views
To bobpursley,
the half life is 40.(potassium 40)
1 answer
asked by
Christine
340 views
How long will it take for Potassium to have a 25% of oringinal radioactive product left?
1 answer
asked by
Christine
277 views
The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.6% of the uranium in the original sample is present, what length of
1 answer
asked by
Anonymous
378 views
A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive decay. After an alpha particle (mass 4.0 u) is emitted,
2 answers
asked by
opp
667 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463 x 10^11 years longer. What is the
3 answers
asked by
.
121 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×10^11 years longer. What is the
3 answers
asked by
Answer
83 views
assume that a particular radioactive-isotope has a half-life of 100 million years. Also assume that the parent isotope is
2 answers
asked by
Rob
570 views
An unstable nucleus undergoes gamma decay. How does the nucleus change?(1 point)
Responses It becomes less stable by emitting
3 answers
asked anonymously
37 views
How does the nucleus change in beta-plus decay?(1 point)
Responses The mass number remains the same, and the atomic number
3 answers
asked anonymously
44 views
Use the equation to answer the question.
146C→147N+0−1e Which type of radioactive decay does the equation model? (1 point)
3 answers
asked anonymously
156 views
Only 43% ofthe carbon-14 in an artifact remains. How old is the artifact?
Would the answer be less than the half life?
3 answers
asked by
Angel
469 views
Uranium-238 decays to Lead-206. The half life of Uranium-238 is 4.5 billion years. If you have a 100 g sample. How much sample
5 answers
asked by
Noah
1,082 views
An unknown radioactive substance has a half-life of 3.20 . If 34.8 of the substance is currently present, what mass was present
2 answers
asked by
cp
517 views
The half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463×1011 years longer. What is the
3 answers
asked anonymously
69 views
Strontium-90 is a radioactive waste product from nuclear reactors. It has a half-life of 29 years. How many years will it take
2 answers
asked by
Heather
1,204 views
Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where
1 answer
asked by
Rock
702 views
OUTLINE
JURSE TOOLS Absolute Age of Rocks and Fossils Quick Check 3 of 4 pa Use this paragraph: The half-life of carbon-14 is
3 answers
asked by
Idk the answer
65 views
Use this paragraph: The half-life of carbon-14 is 5,700 years. A certain sample of wood has 20 grams of carbon-14 when it is
3 answers
asked by
Idk the answer
87 views
What is the half life of a substance if it decays by 75% in two weeks?
1 answer
asked by
katelyn
407 views
A certain radioactive substance has a half-life of 1 hour. If you start with 1 gram of the material at noon, how much will be
2 answers
asked by
cheryl
725 views
When U238 decays into Pb206 via alpha and beta decay, what are the byproducts of the decay?
A. 8 alpha particles and 6 beta rays.
2 answers
asked by
Anonymous
582 views
Why were candies used for this lab? (Replace the word “candy” with whatever you chose to use)
a Candy is easy to clean up and
3 answers
asked anonymously
179 views
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