Energy quantized?

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Ghadir Seder 1G
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Joined: Sat Sep 14, 2019 12:17 am

Energy quantized?

Postby Ghadir Seder 1G » Fri Oct 11, 2019 12:43 am

Professor Lavelle refers to energy being quantized... what does that mean?

Benjamin Feng 1B
Posts: 102
Joined: Sat Sep 07, 2019 12:19 am

Re: Energy quantized?

Postby Benjamin Feng 1B » Fri Oct 11, 2019 12:52 am

Quantized means that the amount of energy released is discrete, not continuous. The values that the energy can take are limited and only certain ones are allowed. This means that an electron might only be able to release only 4.5 * 10^-19 joule or 1.3 * 10^-18 joules of energy but not 8.3 *10 ^-19 or another random value between them. Another example of quantized measurements is the number of atoms. You cannot have half an atom, or else it would not be considered an atom anymore. Because of this, you can only have a whole number of atoms.
Last edited by Benjamin Feng 1B on Fri Oct 11, 2019 12:54 am, edited 1 time in total.

Vincent Leong 2B
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Joined: Fri Aug 09, 2019 12:15 am

Re: Energy quantized?

Postby Vincent Leong 2B » Fri Oct 11, 2019 12:53 am

As he said in one of the lectures, we think of everyday functions in the perspective of classical mechanics. Now, for this chapter specifically, we're studying the smaller units that make up everyday things. The example he referred to was water being poured from a bucket. In classical mechanics, it explains the behavior of large objects and this continuous function that these large objects behave.

Quantum mechanics describes behavior of very small objects that can accept energy in only discrete amounts which defy the continuous properties that we observe on the daily. So referring back to the example of flowing water, a quantized perspective would focus on each individual water molecule.

When Professor Lavelle refers to energy being quantized, he's referring to how variables are existent in these discrete units and have specific quantities rather than being this generic, large form of whatever like we see water to be.

Energy is small and exact. That's the key to quantum mechanics.

I hope I answered your question well and I hope it helps!

Miriam Villarreal 1J
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Joined: Sat Aug 17, 2019 12:16 am

Re: Energy quantized?

Postby Miriam Villarreal 1J » Sun Oct 13, 2019 5:31 pm

Light is absorbed/emitted in discrete units (quanta or photons).Atoms and Molecules only absorb or emit unique frequencies that are allowed by their unique electronic structure (unlike black bodies that absorb and emit all frequencies).

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Re: Energy quantized?

Postby PranaviKolla2B » Sun Oct 13, 2019 5:38 pm

What happens to the extra energy if the energy of a photon is greater than the energy needed to remove an electron?

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Re: Energy quantized?

Postby madeleine_dis1E » Sun Oct 13, 2019 8:20 pm

Ghadir Seder 4F wrote:Professor Lavelle refers to energy being quantized... what does that mean?

I like to think of quantized energy as a tennis ball cannon where it comes in "chunks" rather than the elementary understanding of energy acting as the water from a hose; continuous.

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