# physics

posted by .

In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 × 10−27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the gold nucleus, is fired at 2.6 107 m/s directly toward the nucleus, as in the figure below. How close does the alpha particle get to the gold nucleus before turning around? Assume the gold nucleus remains stationary.

• physics -

mv²/2=k•q₁q₂/r
r = 2k•q₁q₂/mv²,
where
k =9•10⁹ N•m²/C²
e =1.6•10⁻¹⁹ C.
q₁=2e,
q₂=79e
m=6.64•10⁻²⁷ kg
v=2.6•10⁶ m/s

## Similar Questions

1. ### Physics

Ernest Rutherford fired alpha particles (helium nuclei) at a sheet of gold foil rolled as thin as he could get it. Some of these particles passed straight through the foil, some bounced off at various angles, and some rebounded directly …
2. ### physics

In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 10-27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially …
3. ### physics

An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electric force acting on the alpha particle when the alpha particle is 1.7 multiplied by 10-14 m from the gold nucleus?
4. ### Physics?

In Rutherford's scattering experiments, alpha particles (charge = +2e) were fired at a gold foil. Consider an alpha particle, very far from the gold foil, with an initial kinetic energy of 2.0 MeV heading directly for a gold atom (charge …
5. ### physics

In Rutherford's scattering experiments, alpha particles (charge = +2e) were fired at a gold foil. Consider an alpha particle, very far from the gold foil, with an initial kinetic energy of 3.3 MeV heading directly for a gold atom (charge …
6. ### physics

Ok, let's use the following information to very roughly estimate the size of the nucleus. Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.70 …
7. ### physics

Ok, let's use the following information to very roughly estimate the size of the nucleus. Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.70 …
8. ### Physics

In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent …
9. ### physics

An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electric force acting on the alpha particle when the alpha particle is 3.3 ✕ 10-14 m from the gold nucleus?
10. ### Physics help!

An alpha particle(charge +2e) is sent at a speed towards a gold nucleus( +79e ). 1) what is the electric force acting on the alpha particle when it is 2.0 x 10^-14 m from the gold nucleus. 2) if the alpha particle came to a stop at …

More Similar Questions