Homework Help

Nov 2019
3
1
United States of america
q3_chegg.png
I was able to easily find A, yet for b and c i am very confused on how to solve it. For b i did 2(mass of proton) + 2(mass of neutron) = mass of alpha particle
But i don't see how to find the energy from that. Then afterwards i don't see how to find the speed.
 

topsquark

Forum Staff
Apr 2008
2,978
631
On the dance floor, baby!
An alpha particle is a Helium nucleus. How does the mass of Helium differ from your calculation? You can convert this mass difference into energy using the usual \(\displaystyle E = mc^2\).

Here E = KE. So what is the formula for kinetic energy?

-Dan
 
Nov 2019
3
1
United States of america
An alpha particle is a Helium nucleus. How does the mass of Helium differ from your calculation? You can convert this mass difference into energy using the usual \(\displaystyle E = mc^2\).

Here E = KE. So what is the formula for kinetic energy?

-Dan
Oh so I would do 1/2mv^2 =mc, also would the mass in this case be the 2(mass of proton) + 2(mass of neutron) - mass of alpha particle
 

topsquark

Forum Staff
Apr 2008
2,978
631
On the dance floor, baby!
Oh so I would do 1/2mv^2 =mc, also would the mass in this case be the 2(mass of proton) + 2(mass of neutron) - mass of alpha particle
I presume there's a typo: \(\displaystyle \dfrac{1}{2}mv^2 = mc^2\).

Otherwise, yes!

-Dan