With reference to half-lives, what does t1/4 mean?

Question

Does it mean time after which 1/4th of the reactant is consumed (or) time after which 1/4th of the reactant is remaining?

My prof. is all confused and so am I!

Answer 1

T1/4 is the quarter life.  It is the time after which 1/4 of the reactant remains.    This is the same as 2 1/2lives,  as 1/2 x 1/2 = 1/4.  

Answer 2

By analogy with half-life (t½), t¼ should mean the interval required for the quantity to decay to one quarter of its initial value, that is, two half-lives. However, it is a usage that serves no useful purpose and has no currency.

Answer 3

half life means it is the time taken by a substance to become half

suppose 120 gm of some element is with me

1st half life it becomes 1/2 ie. 60

2nd half life it becomes 1/4 ie. 30

3rd half life it becomes 1/8ie. 15

if there is M amount of substance

after 1st HL M/2

after 2nd  HL M/4

after 3rd M/8

i feel  so the queston here is time after which 1/4 reactant exist

but u know time is represented by T alone and no other parameters are used by T letter

may be some fault in question or time after which 1/4th of the reactant is remaining?

feel to be in touch with me

email [e-mail]/yahoo.com( in yahoo add me as ur msngr friend only no emails plz)

search in orkut sreeaharid calicut and select the profile with arjun rampal photo

plz go to my website and rate it link given below do write some comments

any more doubht write it on same question profile

hav a nice day

gud night