Physics Help Forum rate of hydrogen change into helium

 Nuclear and Particle Physics Nuclear and Particle Physics Help Forum

 Oct 19th 2014, 06:44 PM #1 Senior Member   Join Date: Jun 2014 Posts: 306 rate of hydrogen change into helium i cant understand the solution provided. from the ans given, does the author mean (there are 4 hydrogen atoms) , each one will contribute to E (which is 3.82x10^26 W) In my opinion , E (which is 3.82x10^26 W) should be contributed equally by 4 hydrogen atom ... so for me , each hydrogen atom will only contribute to 1/4 E .... 0.25(4.28x10^-12) ( rate of hydrogen change into helium) = 0.25(3.82x10^26) rate of hydrogen change into helium= 8.92x10^37s^-1 Attached Thumbnails
Oct 19th 2014, 07:24 PM   #2

Join Date: Apr 2008
Location: On the dance floor, baby!
Posts: 2,505
 Originally Posted by ling233 i cant understand the solution provided. from the ans given, does the author mean (there are 4 hydrogen atoms) , each one will contribute to E (which is 3.82x10^26 W) In my opinion , E (which is 3.82x10^26 W) should be contributed equally by 4 hydrogen atom ... so for me , each hydrogen atom will only contribute to 1/4 E .... 0.25(4.28x10^-12) ( rate of hydrogen change into helium) = 0.25(3.82x10^26) rate of hydrogen change into helium= 8.92x10^37s^-1
There are 4 H atoms that go into making He. In this process energy is released so we need to find out how much energy. We can compute the mass of each element and calculate the energy lost in the fusion process, which is described in the solution.

Now, each H atom gives an energy of 1/4 of this, so (1/4) x 4.28 x 10^(-12) J. So to calculate the rate of H reduction we divide power by the energy of each H atom.

Everything you have said matches this until your second to the last line, which makes no sense:

0.25(4.28x10^-12) ( rate of hydrogen change into helium) = 0.25(3.82x10^26)

This is an impossible equation. The two sides don't equal each other! What are you trying to say here?

-Dan
__________________
Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup.

See the forum rules here.

 Tags change, helium, hydrogen, rate

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post homertyson Quantum Physics 1 Mar 8th 2013 10:11 AM topsquark Quantum Physics 0 Mar 8th 2013 09:07 AM sheenarbw Nuclear and Particle Physics 3 May 29th 2011 12:31 PM Glitch General Physics 2 Oct 8th 2010 12:02 AM Rumor Advanced Waves and Sound 1 Sep 29th 2010 06:48 PM