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How to pronounce this equation?

Sat 12 Dec, 2015 10:31 pm
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Type: Question • Score: 1 • Views: 638 • Replies: 5
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View best answer, chosen by oristarA
Kolyo

1
Sat 12 Dec, 2015 11:52 pm
@oristarA,
The circular thing is called a "sigma" -- a Greek letter, lowercase.

The h with a line through it is pronounced "h-bar".
oristarA

1
Sat 12 Dec, 2015 11:58 pm
@Kolyo,
Kolyo wrote:

The circular thing is called a "sigma" -- a Greek letter, lowercase.

The h with a line through it is pronounced "h-bar".

Thank you.
But I knew that. I meant how to read the equation.
Sigma x multiplied by sigma p is greater than or equals to h bar divided by two?
Kolyo

2
Sun 13 Dec, 2015 12:02 am
@oristarA,
Yes.

Let me add: sigma typically represents standard deviation of a probabilty distribution -- how much uncertainty there is about the value of the variable. You will notice that if you cut sigma-x in half and become twice as certain about the value of position, then sigma-p has to double, so you become half as certain about the value of momentum.
oristarA

1
Sun 13 Dec, 2015 12:07 am
@Kolyo,
Cool.
Kolyo

2
Sun 13 Dec, 2015 12:10 am
@oristarA,
Sometimes we say "over 2" instead of "divided by 2". Physicists are visual people.
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