Calculate the kinetic energy of two alpha particles

AI Thread Summary
To calculate the kinetic energy of two alpha particles resulting from the capture of a proton by lithium-7, one must first balance the nuclear reaction equation. The mass of the lithium nucleus is given as 7.01601u, and the proton's energy can be neglected. By adding the rest masses of the reactants and products, the difference in mass will yield the energy released, which translates into the kinetic energy of the alpha particles. The solution assumes no gamma radiation is emitted during the reaction. This method effectively allows beginners to approach similar physics problems.
emmadun
Messages
8
Reaction score
0
if lithium 7 3 captures proton, it is divided into two alpha particles. Calculate the kinetic energy of the alpha particles. the proton energy can be neglected and the mass of the nucleus of Li is 7,01601u.
I only know how to write the equation: 3Li7 + 1H1 → 2He4 + 2He4

Can anyone help me? How do i calculate the kinetic energy of the alpha particles??
p.s sorry I am a beginner in physics and I am trying really hard to solve these kind of problems.

Mentor Note -- Thread moved from the technical forums so now Homework Template is shown.
 
Last edited by a moderator:
Physics news on Phys.org
Simple solution: Add the rest masses of both sides of the equation. The difference is then energy. Assuming no gamma rays, the energy becomes kinetic energy of the two alpha particles.
 
  • Like
Likes emmadun
AH THANK YOU! you saved me
 
Last edited by a moderator:
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...

Similar threads

Back
Top