Mimicking the experiment of Geiger and Marsden, you fire alpha ...

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Mimicking the experiment of Geiger and Marsden, you fire alpha particles of about 5 MeV into an unknown target and measure the scattering angle. Which of the following is likely to affect the scattering angle of the alpha particles coming off of the target?
 
 

A. The temperature of the target.
  B. The number of electrons orbiting the nuclei of the target.
  C. The Coulomb force between the alpha particle and the electrons in the target.
  D. The Coulomb force between the alpha particle and the nuclei of the target.

 

Question 2

Which of the following statements best describes the Franck-Hertz experiment?
 

A. Alpha particles slam into gold foil to measure the recoil angle.
  B. Light incident on a metal surface ejects electrons and the more energetic ones establish a current.
  C. Accelerated electrons collide with atoms in a gas and excite them.
  D. A strong electric field tears electrons off of atoms in a gas to establish a current.
  E. Passing electrons through a magnetic field to separate electrons with different spin components.

[ebe]

Answer to Question 1

D,
The Coulomb force dominates in scattering experiments at lower energies, and within the Coulomb force only the massive, positive nucleus of the target interacting with the alpha particle determines the scattering angle.

Answer to Question 2

C.
The Franck-Hertz experiment involved colliding accelerated electrons and atoms in a gas, thereby exciting the atoms when the electrons give up some kinetic energy. The experiment showed that transitions of electrons to higher energy states are quantized and in calculable intervals.

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TYSM

[lcapri7]

Gracias!