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Re: Physics Question

From moroney@world.std.spaamtrap.com (Michael Moroney)
Newsgroups sci.physics
Subject Re: Physics Question
Date 2016-07-08 15:06 +0000
Organization The World : www.TheWorld.com : Since 1989
Message-ID <nlofhc$lat$2@pcls7.std.com> (permalink)
References <nllle2$1q3n$1@gioia.aioe.org> <nlnj6p$4h7$1@dont-email.me>

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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.

>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.

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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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