## Half-life

Posts: 58
Joined: Fri Sep 29, 2017 7:04 am

### Half-life

Is T always equal to 1/2 or what does it depend on?

Salman Azfar 1K
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

### Re: Half-life

Usually a half life is a time value for how long it takes half of a substance to be converted or something along those lines. Because of that it is pretty much always notated T1/2 but often you need to use multiple half lives to get a smaller amount. Like it I wanted to know the amount of time for something to decay to 1/4 of its original I'd need to cut it in half two times in a row so I would add together two half lives.

Nicole Anisgard Parra 2H
Posts: 39
Joined: Sat Jul 22, 2017 3:01 am

### Re: Half-life

It's not that t (the time) itself is necessarily equal to 1/2; the notation simply tells you that you must find the time required for any specified concentration or amount to decrease by half.

Amanda Wu 2C
Posts: 31
Joined: Sat Jul 22, 2017 3:00 am

### Re: Half-life

The half life is the time it takes for the concentration of a species to decrease to half its initial concentration. It can be 1/2 (whatever time units is used in a particular case) but the half life itself is not always 1/2. It just means the time it takes for a species' concentration to become 1/2 its initial concentration.

Guangyu Li 2J
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

### Re: Half-life

Half-life usually describes the decay of discrete entities, and it describes the time that a material left only half of its original content. As a result, T does not always equal to 1/2. For example, it can be 1/4 which is the 1/2 of the 1/2 of the original material after two half-life time intervals.