1. This forum is for support and discussion only. Please promote test prep materials/services (including AMAs) in the Special Offers subforum only. Thanks!
    Dismiss Notice
Dismiss Notice

Interview Feedback: Visit Interview Feedback to view and submit interview information.

Interviewing Masterclass: Free masterclass on interviewing from SDN and Medical College of Georgia

Rutherford expt

Discussion in 'MCAT Study Question Q&A' started by Sonyfan08, Jul 29, 2011.

  1. Sonyfan08

    7+ Year Member

    Joined:
    Dec 4, 2008
    Messages:
    148
    Likes Received:
    0
    Status:
    Pre-Medical
    why did he have to use wavelengths smaller than the subatomic particles to detect the location nucleus?
     
  2. Majik

    Joined:
    Jul 19, 2011
    Messages:
    91
    Likes Received:
    2
    I'm not entirely sure, but as an extreme example, imagine you placed a small ball in front of a light source,behind the ball is a white screen. The ball will cast a shadow on the screen. Now imagine putting a small pebble directly behind the ball. Provided the ball is much larger than the pebble, would you still be able to see the shadow of the pebble? No. The large ball's shadow blocks the any shadow of the pebble from forming. In this scenario, you would need something smaller than the pebble. For Rutherfords experiment, I believe what he did was shoot alpha particles at a gold foil. Relative to the gold atoms, the alpha particles were much smaller (the size of a helium nucleus) and so they were able to pass through the electron cloud into the fluorescent screen. Occasionally, alpha particles would hit the nucleus and fly back, but the important thing to realize is that most of those alpha particles would pass through, and those that did displaied a "shadow" of the nucleus on the screen, since the alpha particles passed through the electron cloud (but not through the nucleus). This gave Rutherford some idea of what atomic structure could look like.
     

Share This Page