What is a vacuum?

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Noah Carey 1G
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What is a vacuum?

Postby Noah Carey 1G » Sun Apr 15, 2018 2:57 pm

The photoelectric experiment must be done "in a vacuum." When an experiment is done in a vacuum what does this mean and what does this look like?

Ismail 1F
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Joined: Wed Nov 15, 2017 3:02 am

Re: What is a vacuum?

Postby Ismail 1F » Sun Apr 15, 2018 3:24 pm

A vacuum is a region of space with nothing in it, so when an experiment is done in a vacuum, all the photons, air, and particles are removed from the region to create a space of nothing but pressure. The photoelectric experiment showed this effect of electrons being "ejected" from the metal.

Bianca Nguyen 1B
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Re: What is a vacuum?

Postby Bianca Nguyen 1B » Sun Apr 15, 2018 4:12 pm

To add to that, the photoelectric experiment must be done in a vacuum so the electrons do not collide with random molecules in the air like CO2 for example

Jesus A Cuevas - 1E
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Re: What is a vacuum?

Postby Jesus A Cuevas - 1E » Sun Apr 15, 2018 5:02 pm

I believe the purpose of a vacuum in this experiment ensures that the ejection of the electrons from the metal observed was a result of the applied photons, and not other variables that could have potentially contributed to the ejection of the electrons if not removed (i.e. air molecules).

colecabling1A
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Re: What is a vacuum?

Postby colecabling1A » Sun Apr 15, 2018 6:35 pm

I believe when Dr. Lavelle stated that the photoelectric effect must be done in a vacuum, this means that the experiment must be conducted free of any external particles. There must be nothing in the region in which the experiment takes place, simply whatever pressure may exist (but free of any protons, electrons, etc.)

Chem_Mod
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Re: What is a vacuum?

Postby Chem_Mod » Sun Apr 15, 2018 7:58 pm

A vacuum is a space devoid of any objects. To experimentally create a vacuum, one must try to use a motor to try to pump out all of the molecules out of that given space.

004985802
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Re: What is a vacuum?

Postby 004985802 » Thu Apr 19, 2018 8:07 pm

Vacuum is a space the is completely empty (so that no other particles or forces are present that could affect the state of the substance you're investigating)

YeseniaGomez_1L
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Re: What is a vacuum?

Postby YeseniaGomez_1L » Thu Apr 19, 2018 8:41 pm

A vacuum is basically an empty space, as in there is no other molecules to affect the experiment. So in these vacuums gaseous pressure is much less than atmospheric pressure.


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