Physics?

posted by .

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 +79e). The alpha particle will come to rest when all its initial kinetic energy has been converted to electrical potential energy. Find the distance of closest approach between the alpha particle and the gold nucleus.

  • Physics? -

    convert 2MeV to joules.
    energy=2eVE6=2E6*1.602×10−13 J=2*1.6E-7 Joules

    Now set that energy to the PE at the closest point

    EPE=k2e*79e/d=8.98*2*(1.6^2)(79)(1E-26)/r

    set it equal to the initial KE
    2*1.6E-7*d=8.98*2*1.6^2 E-26*79)

    d= 8.98*79*1.6 E -19 meters

    check that.

  • Physics? -

    ÔÚ

Respond to this Question

First Name
School Subject
Your Answer

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

    How does Rutherford's model of the atom account for the back-scattering of alpha particles directed at the gold foil?
  3. 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 …
  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 3.3 MeV heading directly for a gold atom (charge …
  5. 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, …
  6. Physics

    Rutherford, Geiger, and Marsden (his students) fired a beam of alpha particles at a gold foil. The alpha particles had an energy of about 3.6 million electron volts, a charge of +2e, and a mass of about four AMU (one Atomic Mass Unit …
  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

    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 …
  9. 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 …
  10. Chemistry

    What specific evidence from the gold foil experiement led Rutherford to come to each of the following conclusions?

More Similar Questions