Question

PLEASE HELP DUE TOMORROW
What is the half life of each of these radioactive isotopes?
A) a radioactive isotope decreased to one-half its original amount in 18 months.
B) a radioactive isotope decreased to one-fourth its original amount 100 years.

Answer 1

Hey there!

What do you think it should be?

Answer 2

Basically, half life is the time taken for the radioactivity of a specified isotope to fall to half its original value.

Answer 3

honestly i am trying but i havent an inlking of the answer

Answer 4

Read the definition i just told you, it says half life is the time taken to reduce to half of its original value.

Now see what they say in Q#1, they say that the radioactive isotopes got reduced to half in 18 months. So what should be the half life of this isotope?

Answer 5

6 months

Answer 6

oh 18 months

Answer 7

Yes, that's \(\huge \checkmark\)

Answer 8

thx and number 2

Answer 9

50 years

Answer 10

am i right on 50 years and Thank you so much for the help can you help with this to please i need to determine wheter its a chemical or nuclear reaction occuring.
A) when two compounds are combined heat is released.
B) a sample of galllium-68 is reduced to one-half of its original amount in 68.3 minutes.
C) Radium-226 decays to radon 222
D) A spark of energy is used to begin the combustion of methane gas.
E) Hydrogen nuclei are fused in the sun to make helium atoms.

Answer 11

recognize 1/4 as a fraction associated with 2 half-lives (from (1/2)2 = 1/4)

\(\therefore\) Half life X 2=100
=> Half life = 100/2=50

Answer 12

Ask, one question per post. Repost your next question in a new thread \(\huge \ddot \smile\)

Answer 13

ok, do that from next question....let's do this one here only..

Let's talk one by one.

What do you think about A ?

Answer 14

chemical

Answer 15

Yes, that's correct. Whenever two \(\bf Compounds\) combine and heat is released or absorbed it is chemical reaction. If heat is released then it is called as exothermic chemical reaction and if energy is absorbed then it is called as endothermic chemical reaction... Next

Answer 16

nuclear

Answer 17

Yes, radioactivity is nuclear reaction. Next

Answer 18

chemical

Answer 19

Sorry, next is C. It's decay, it's also radioactivity and hence it is nuclear reaction and not chemical reaction.

Answer 20

Got it?

Answer 21

d is che,mical

Answer 22

YEs, D is combustion as I told you, it's exothermic chemical reaction. Next

Answer 23

e is nuclear

Answer 24

Very Good!

Last one is Fusion reaction which is a nuclear reaction. this reaction is the source of sun's energy.

Answer 25

thx for all the help

Answer 26

Ur most welcome :)