Free energy from Thorium to Radon

228 224 4
Th --> Ra + He
90 88 2

228,031015u --> 224,020186u + 4,0026033u

228,031015u - [224,020186u + 4,0026033u]=

0,0082257u

0,0082257u x 931.49 MeV = 7662157,293eV

7662157,293eV x (1.602 x 10^-19J) =

1,2274776 x 10^-12J

Svar: Frigjorda energin är: ~ 1.23 x 10^-12J

Hi, people could anyone check what I've done wrong here??? My teacher says the answer value is a bit too high. It's just arithmetic and I've still done something wrong...

I tried multiplying the (0,0082257u) with (1.66 x 10^-27) x C^2 and I still get ~ 1.23 x 10^-12J

Thanks.

Last edited:

Related Introductory Physics Homework Help News on Phys.org
Andrew Mason
Homework Helper
228 224 4
Th --> Ra + He
90 88 2

228,031015u --> 224,020186u + 4,0026033u

228,031015u - [224,020186u + 4,0026033u]=

0,0082257u

0,0082257u x 931.49 MeV = 7662157,293eV

7662157,293eV x (1.602 x 10^-19J) =

1,2274776 x 10^-12J

Svar: Frigjorda energin är: ~ 1.23 x 10^-12J

Hi, people could anyone check what I've done wrong here??? My teacher says the answer value is a bit too high. It's just arithmetic and I've still done something wrong...

I tried multiplying the (0,0082257u) with (1.66 x 10^-27) x C^2 and I still get ~ 1.23 x 10^-12J

Thanks.