Re: Physics Question

From	Odd Bodkin <bodkinodd@gmail.com>
Newsgroups	sci.physics
Subject	Re: Physics Question
Date	2016-07-08 10:11 -0500
Organization	Aioe.org NNTP Server
Message-ID	<nlofq5$1hc6$1@gioia.aioe.org> (permalink)
References	<nllle2$1q3n$1@gioia.aioe.org> <nlnj6p$4h7$1@dont-email.me> <nlofhc$lat$2@pcls7.std.com>

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On 7/8/2016 10:06 AM, Michael Moroney wrote:
> Poutnik <poutnik4nntp@gmail.com> writes:
>
>> Dne 07/07/2016 v 15:28 Sergio napsal(a):
>>> 1. A sample of radioactive nuclei of a certain element can decay only by
>>> gamma-emission and beta-emission. If the half-life for gamma-emission is
>>> 24 minutes and that for beta-emission is 36 minutes, the half-life for
>>> the sample is
>>>
>>> (A) 30 minutes
>>> (B) 24 minutes
>>> (C) 20.8 minutes
>>> (D) 14.4 minutes
>>> (E) 6 minutes
>>>
>> F: Incomplete scenario definition without probabilities.
>
> The half-lives give the probabilities.

Right, and the answer is D, I believe.

>
>> Aside of that, gamma emission itself is not radioactive decay,
>> it is releasing energy of excited kernel.
>
> Some isotopes have "meta" (excited) states that can give off
> a gamma to become the ground state.  Some of these isomers
> can also decay radioactively to something else by giving off an
> alpha or beta.  And sometimes the ground state can't decay
> the same way the isomer can.
>


-- 
Odd Bodkin --- maker of fine toys, tools, tables

Thread

Physics Question Sergio <invalid@invalid.com> - 2016-07-07 08:28 -0500
  Re: Physics Question Poutnik <poutnik4nntp@gmail.com> - 2016-07-08 09:02 +0200
    Re: Physics Question Sergio <invalid@invalid.com> - 2016-07-08 09:19 -0500
    Re: Physics Question moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-07-08 15:06 +0000
      Re: Physics Question Odd Bodkin <bodkinodd@gmail.com> - 2016-07-08 10:11 -0500
        Re: Physics Question benj <benj@nobody.net> - 2016-07-08 17:12 -0400
          Re: Physics Question Odd Bodkin <bodkinodd@gmail.com> - 2016-07-08 16:32 -0500
            Re: Physics Question Sergio <invalid@invalid.com> - 2016-07-10 11:15 -0500
              Re: Physics Question Fabian Russell <fb@zen.info> - 2016-07-10 19:25 +0000
                Re: Physics Question Odd Bodkin <bodkinodd@gmail.com> - 2016-07-10 15:43 -0500
                Re: Physics Question Fabian Russell <fb@zen.info> - 2016-07-10 21:52 +0000
                Re: Physics Question Odd Bodkin <bodkinodd@gmail.com> - 2016-07-11 07:50 -0500
                Re: Physics Question Poutnik <poutnik4nntp@gmail.com> - 2016-07-11 17:04 +0200
                Re: Physics Question moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-07-11 01:20 +0000
      Re: Physics Question Poutnik <poutnik4nntp@gmail.com> - 2016-07-08 19:01 +0200
        Re: Physics Question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2016-07-09 21:28 +0200
          Re: Physics Question moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-07-10 02:18 +0000
    Re: Physics Question Fabian Russell <fb@zen.info> - 2016-07-09 17:11 +0000

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