## Quanta

$c=\lambda v$

TanveerDhaliwal3G
Posts: 105
Joined: Fri Aug 30, 2019 12:17 am

### Quanta

In the 10/04 lecture, Lavelle mentioned that light is absorbed/emitted in discrete units(quanta or photons). What is quanta and what are its units?

Haley Fredricks 1B
Posts: 53
Joined: Sat Aug 24, 2019 12:16 am
Been upvoted: 2 times

### Re: Quanta

I don't think quanta have units, but rather act like moles which can be used to describe the amount of something (in this case energy).

Christine Honda 2I
Posts: 116
Joined: Sat Sep 14, 2019 12:17 am

### Re: Quanta

A photon is a quanta, but not all quanta are photons. This is similar to all squares are rectangles but not all rectangles are squares.

"A photon is the quantum of electromagnetic radiation. The term quantum is the smallest elemental unit of a quantity, or the smallest discrete amount of something. Thus, one quantum of electromagnetic energy is called a photon. The plural of quantum is quanta."

I dont believe quanta have units though.

Chris Tai 1B
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

### Re: Quanta

Quanta or quantum in Latin is "how much", indicating that it's more of an amount of something that lacks units. For instance, in the context of photons, these quanta can simply be "packets" as Max Planck suggested of energy. The effect of these packets can be observed by analyzing the interaction between electromagnetic waves and matter.

CNourian2H
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

### Re: Quanta

We use quantum mechanics to describe the behavior of very small objects that can accept energy only in discrete amounts. These discrete amounts are called quanta. It's easy for me to think about quanta as the smallest unit of any physical property- whether that is energy, matter, etc. It is like a part that makes up a whole.