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Radioactivity
Page 5
Questions (539)
Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5x10^9 years. The half-life of
3 answers
asked by
Mucho
55 views
how long will it take Uranium-238 for there to ne 25% of the original radioactive period to be left? i need this question
1 answer
asked by
melinda
388 views
How do you set up this problem?
The decay constant for the radioactive element cesium 137 is .023 when time is measured in years.
3 answers
asked by
Jillian
1,100 views
If a sample of Sr-90 initially contains 1.1 mmol of Sr-90, how many millimoles are left after 25.20 years?
any ideas on where to
1 answer
asked by
Anonymous
353 views
The mass of a radioactive sample is represented in the graph below. The initial mass of 32 mg decays to 8 mg after 21 hours.
1)Wh
2 answers
asked by
alejandro
545 views
Why were candies used for this lab? (Replace the word “candy” with whatever you chose to use)
a Candy simulates how atoms
3 answers
asked by
URMUM
108 views
Given that the radioactive decay equation is q = 1250 e-0.05t, if t is in months, the amount of milligram present after 4½ year
1 answer
asked by
romain
376 views
Which is the BEST definition of Half-Life?
a The half-life of a substance or element is the amount of time it takes for half of
3 answers
asked by
dully
171 views
the half-life on uranium-235 is 700,000,000 years. the half-life of uranium-238 is 4.463x10^11 years longer. what is the
3 answers
asked by
human
127 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
only in ohio
47 views
The quantity of a radioactive substance decays according to the function Q (t) = 100e -1/4. where t represents time in years
3 answers
asked anonymously
36 views
a certain radioactive isotope has a half life of approx 1,300 years .
How many years to the nearest year would be required for a
2 answers
asked by
HM
536 views
Cesium 138 has a half life equal to 32.2 minutes. how long will it take for 2/4 of this sample to decay
2 answers
asked by
christine
894 views
Help!
Initially there are 6x10^9 radioactive of element W (decay constant 0.173/day) in a sample. As a nucleus of W decays, it
1 answer
asked by
Jenn
413 views
The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
3 answers
asked by
URMUM
80 views
The half-life of uranium-235 is 700,000,000 years The half-life of uranium-238 is 4.463 * 10 ^ 11 years longerWhat the half-life
3 answers
asked by
Jay
47 views
The half-life of uranium-235 is 700,000,000 years The half-life of uranium-238 is 4.463 * 10 ^ 11 years longerWhat the half-life
3 answers
asked by
Jay
50 views
An investigator receives Co-60 (5.27 year half life) for use in a research study.
Unfortunately the Co-60 is contaminated with
3 answers
asked by
amy
436 views
The half-life of a radioactive isotope is the amount of time it takes for a quantity
of radioactive material to decay to one-half
1 answer
asked by
Justin
896 views
The half-Life of radioactive earthium is 2651 years. Find how many years it will take 100 grams of earthium to decay to 10
1 answer
asked by
Alex
364 views
How much of a radioactive element becomes stable in ONE half-life?
a All of the original amount of atoms b None of the atoms will
3 answers
asked anonymously
102 views
What is the half-life of Candium? (i.e., What number of shakes are necessary to reduce the radioactive members to one-half?)
a
3 answers
asked anonymously
122 views
A radioactive isotope(h=4.5days) was prepared. This isotope was used 14 days later when it had an activity of 6000000 Bq. What
4 answers
asked by
Stewart
472 views
The activity of a sample of a radioactive isotope is 1800Bq. If this isotope has a half-life of 16 days, what is the activity
1 answer
asked by
Matthew
445 views
If 50% of a radioactive element remains after 4000 years, what is the half-life?
a 1 half-life b 2 half-lives c 3 half-lives d 4
5 answers
asked by
JACK HAMMMMMMER
172 views
The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of the radioactive atoms in it
3 answers
asked by
JACK HAMMMMMMER
146 views
The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of the radioactive atoms in it
3 answers
asked by
JACK HAMMMMMMER
95 views
How much of a radioactive element becomes stable in ONE half-life?
a. Half of the original amount of atoms b. None of the atoms
3 answers
asked by
Else
25 views
The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of the radioactive atoms in it
3 answers
asked by
66665445
49 views
How much of a radioactive element becomes stable in ONE half-life?
a Half of the original amount of atoms b None of the atoms
3 answers
asked by
dully
28 views
What is the half-life of Candium? (i.e., What number of shakes are necessary to reduce the radioactive members to one-half?)
a 6
3 answers
asked by
dully
45 views
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain 7,500 years?
a 25% b 1.5625% c
3 answers
asked by
dully
41 views
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has
3 answers
asked by
JACK HAMMMMMMER
80 views
The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
3 answers
asked by
Snaggy
50 views
When a radioactive sample decays, there is one less parent nuclei and one more daughter nuclei. As this decay process continues,
2 answers
asked by
Anonymous
999 views
Pick the radioactive isotope in each set
14/7 N OR 23/13 AL EXPLAIN A)its atomic number is greater than 83 B)it has fewer n than
3 answers
asked by
Ashley
716 views
The half-life of Xe-133 is 126 hours. Starting with 250. mg, after 500 hours around how many mg remain?
A. 63 B. 16 C. 32 D. 125
1 answer
asked by
Charleze
388 views
If 250 mg of a radioactive element decays to 200 mg in 48 hours, find the half-life of the element
2 answers
asked by
Dom
971 views
A piece of charcoal of mass 35g is found in the ruins of an ancient city. The sample shows a carbon-14 activity or R(t)=4.167
2 answers
asked by
Moe
589 views
The radioactive isotope of Carcon (^14C)has a half life of 5730. What is the decay constant of ^14C? If we start with a sample
2 answers
asked by
Moe
549 views
Radon-22 has a half life of 4 days. If you begin with 32 grams of radon, how many grams will be left after 20 days?
3 answers
asked by
Kipper
318 views
A radioactive sample of 141Cs has a half-life of 32.5 days. In a sample that contains 8.00*10^7 nuclei of 141Cs, how many beta
1 answer
asked by
David
965 views
Match the word to its definition/description.
Column A 1. Radioactivity: Radioactivity 2. Radioisotope: Radioisotope 3. Isotope:
3 answers
asked anonymously
40 views
The half-life for a 100-gram sample of radioactive element X is 10 days. How much of element X remains after 30 days have
3 answers
asked anonymously
67 views
What is the correct formula for calculating the age of a meteorite if using half-life?
3 answers
asked anonymously
23 views
i need help on a question
"Describe how Earth would be different today if it contained no radio active material. What would the
1 answer
asked by
Anomynous
364 views
The process in which an unstable atomic nucleus emits charged particles and energy.
a chemical reaction b radioactivity c
3 answers
asked anonymously
47 views
The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
3 answers
asked anonymously
80 views
The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
3 answers
asked anonymously
275 views
List the three types of radioactivity by increasing ability to penetrate matter.
1 gamma rays 2 beta rays 3 alpha rays ?
1 answer
asked by
Bev
427 views
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