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Radioactivity
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Questions (539)
The half life of radon 222 is 3.82 days. If the initial mass of a sample of radon 222 is 198.72 grams, how much will remain
4 answers
asked by
Jess
1,089 views
An unknown radioactive substance has a half-life of 124 years. How long will it take a 67 grams sample to degrade to 18 grams?
3 answers
asked by
Maria
960 views
If 1g of sodium-24 has decayed from a sample that was orinally 2g. How old is the sample?
3 answers
asked by
michael
887 views
The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in
3 answers
asked by
Andrew
1,367 views
the mass of cobalt-60 in a sample is found to have decreased from 0.800g to 0.200g in a period of 10.5 years. from this info
3 answers
asked by
shaleena
911 views
suppose you had two samples of the same radioactive isotope. one sample had a mass of 25 grams. the other had a mass of 50
4 answers
asked by
hannah
1,929 views
Explain how the half-life of a radioactive isotope affects the usefulness of that isotpe in dating specific types of rock?
3 answers
asked by
brooke
1,688 views
You have 4,592 grams of a radioactive kind of scandium. How much will be left after 168 days if its half-life is 84 days?
3 answers
asked anonymously
129 views
The half-life of Radium-223 is 11.43 years. What is the annual decay rate? Express the result to four decimal places.
3 answers
asked by
Meg
92 views
The half life of radium is 3.82 days. In what time will the activity decay to (1/16) of its original value.
3 answers
asked by
Devika
281 views
If one has 24 kg of Polonium and it undergoes two half-lives, how much do you have left?
A) 12 kg B) 3 kg C) 6 kg D) 2 kg IdK
7 answers
asked by
PLZ HELP ME
1,242 views
The radioactive isotope, phosphorus-32, has a half-life of 14.26 days. How much phosphorus-32 will remain after 60 days? Please
2 answers
asked by
Anonymous
1,241 views
A sample starts with 1000 radioactive atoms. How many half-lives have elapsed when 875 atoms have decayed?
I am not sure how to
7 answers
asked by
Amena
2,351 views
If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?
3 answers
asked by
Don
1,544 views
The charcoal from ashes found in a cave gave 3.34 14C counts per gram per minute. wood from the outer portion of a growing tree
3 answers
asked by
TP
1,089 views
The half-life of Strontium-90 is 28 a. If 60 g of this isotope is currently in a sample of soil, estimate the amount in the same
3 answers
asked by
Laura
546 views
A particular radioactive element has a half life of 10.0 days. How much is left after 30.0 days if the sample started with 345g?
3 answers
asked by
Please help
890 views
An unknown radioactive element decays into non-radioactive substances. In 120 days the radioactivity of a sample decreases by 59
3 answers
asked by
Erica
671 views
Radium-223 has a half-life of 11.4 days. Approximately how long would it take for the activity of a sample of 223Ra to decrease
3 answers
asked by
sierra
1,197 views
The emission of high energy particles from the nucleus of an atom is called
A. radioactivity B. electromagnetism C. transmutation
3 answers
asked by
Neena
647 views
Can someone help with this one? Half life of 55Cr is about 2 hours. A sample of the isotopes delivered from the reactor to lab
3 answers
asked by
Marissa
1,756 views
Po-210 Ia an alpha emitter with a half-life of 138 days. how many grams of Po-210 remain after 552 days if the sample initially
4 answers
asked by
Shay
833 views
The half-life of oxygen-15 is 124 s. If a sample of oxygen-15 has an activity of 4800 Bq, how many minutes will elapse before it
4 answers
asked by
Anonymous
1,581 views
A typical dose of a radioactive sample is 27.0 mCi. How long does it take for the activity to reduce to 0.100 mCi? The half life
3 answers
asked by
bekah
543 views
indium-115 has a half life of 4.5 hours, if you start with a 12.0mg sample of indium-115, how much will remain after 13.5 hours
3 answers
asked by
Denis
864 views
The half-life of a certain radioactive isotope is 32 hours.What fraction of the sample would remain after 16
5 answers
asked by
john
748 views
Find the half-life (in hours) of a radioactive substance that is reduced by 10 percent in 5 hours.
2 answers
asked by
David
905 views
If 30% of a sample of radioactive isotope decays in 24 hrs, what is the half-life?
How do i know which order to use? and do I
3 answers
asked by
tina
543 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
zeo
43 views
A 1.00-g sample of carbon from a modern
source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source
3 answers
asked by
Eddy
527 views
A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.
3 answers
asked by
Eric
680 views
Q1) If there are 100 radioactive atoms with a half-life of 30 seconds, how many radioactive atoms will remain after one
3 answers
asked by
Marium
704 views
a certain radioactive isotope has a half life or 850 years.how many years would it take for a given amount of this isotope to
3 answers
asked by
Kiesha
642 views
If radon-222 has a half-life of 3.8 days, determine how long it takes for only 1/8 of a sample to remain.
2 answers
asked by
Joe
893 views
How do you calculate the amount of a radioactive substance remaining after an integral number of half-lifes have passed?
3 answers
asked by
Tristan
582 views
Radioactive iodine treatment is so successful at treating hyperthyroidism that it has virtually replaced thyroid surgery. To the
4 answers
asked by
Liz
1,522 views
A sample originally contained 2.5 g of rubidium 87 now contains 1.25 g. The half life of rubidium - 87 is 6 x 10 ( to the 10th)
4 answers
asked by
sam
643 views
The half-life of iodine -125 is 60 days. What fraction of iodine-125 would be left after 180 days?
my teacher didn't teach us
3 answers
asked by
Taylor
1,821 views
How long will it take for the radiation level of strontium-85 to drop to one-sixteenth of its original level?
Express your answer
2 answers
asked anonymously
14 views
A 130-mg sample of technetium-99 m is used for a diagnostic test. If technetium-99 m has a half-life of 6.0 h, how many
2 answers
asked anonymously
45 views
I'm kinda in a rush but take your time!Thx!
1.What was Henri Becquerel studying when he accidentally discovered radioactivity?
58 answers
asked by
I am awesome
14,445 views
A radioactive isotope has a decay constant of 9.68E-03 /s. Calculate the time taken for three quarters of a sample of the
4 answers
asked by
Garou
69 views
Assume a substance has a half-life of 15 years and the initial amount is 147 grams.
How much remains at the end of 10 years?
1 answer
asked by
Lexi
76 views
Play/Run the Gizmo with these settings at least once.
What is the half-life for Isotope B based on the data in the Gizmo?
1 answer
asked by
K
116 views
OBronium-12 is a radioactive material that spontaneously decays when it comes in contact with oxygen. One minute after a 200-mg
1 answer
asked by
Michelle
400 views
If the sample has a half life of 5 seconds, how much is left after 25 seconds?
12.5% 25% 3.125%** 6.25%
3 answers
asked by
Elsy
314 views
radium decomposes at a rate proportional to the amount instantaneously present.Find the half-life of radium if three-fourths of
6 answers
asked by
HELP ME PLEASE
729 views
At the beginning of an experiment, a scientist has 296 grams of radioactive goo. After 120 minutes, her sample has decayed to
1 answer
asked by
Katie
287 views
At the beginning of an experiment, a scientist has 296 grams of radioactive goo. After 120 minutes, her sample has decayed to
1 answer
asked by
Tommy
263 views
Trtitum, a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an into tail amount sample of 50 grams, how much
2 answers
asked by
Alexis
719 views
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