Two Kinds of Properties

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Elyssa Smith 4B
Posts: 58
Joined: Wed Sep 18, 2019 12:22 am

Two Kinds of Properties

Postby Elyssa Smith 4B » Mon Oct 14, 2019 8:16 am

What does it mean for an electron to have wavelike and particle like properties?

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: Two Kinds of Properties

Postby Justin Sarquiz 2F » Mon Oct 14, 2019 8:55 am

In the photoelectric effect lab, a light was shined on a metal surface in order to measure what energy was needed to remove an electron from different metals. If a certain wavelength did not remove an electron, then we would expect that increasing the intensity should remove an electron if light acted as a wave. However, increasing the intensity did not eject the electron at a wavelength that did not work. One had to decrease the wavelength in order to eject the electron. At a wavelength that ejected an electron, increasing the intensity increased the amount of electrons ejected, so light acts as a particle made up of photons in this experiment.

In another experiment, light is shined through a slit in the wall. If light acted as a particle, then the light should shine straight through the slit. However, light was diffracted, which shows how light acts as a wave. Light is diffracted because of the different waves overlapping and hitting each other.

Robin Cadd 1D
Posts: 113
Joined: Thu Jul 11, 2019 12:16 am

Re: Two Kinds of Properties

Postby Robin Cadd 1D » Mon Oct 14, 2019 11:02 am

It means that light can behave like a wave, or light can behave like a particle. Depending upon the situation, one of these behaviors may emerge more prominently than the other. This is illustrated by Justin's experimental examples.

Kayli Choy 2F
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: Two Kinds of Properties

Postby Kayli Choy 2F » Tue Oct 15, 2019 10:08 am

Another experiment that demonstrated the wave-like properties of electrons was when electrons were passed through a crystal lattice, and a diffraction pattern resulted. This led de Broglie to believe that all particles with momentum have wave-like and particle-like properties, but the wave-like properties are only observable for objects with a small mass (like electrons) and high velocity.


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