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Chemistry: 4.9 Walk the Planck 58 Views
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Description:
Yarr, we be talkin' about Planck's constant today. It doesn't actually have anything to do with pirates, but we'll take the opportunity to talk like one whenever we get it.
Transcript
- 00:04
Only a handful of
- 00:05
individuals in recorded history have
- 00:07
been lucky enough to have their own [Man wearing prison clothing]
- 00:09
number. Avogadro has one. So do you Euler, Newton, and Hubble.
- 00:15
And don't forget about
Full Transcript
- 00:16
Nathaniel fifteen, and we're sure you've all
- 00:19
heard of that one. Yet another scientific
- 00:21
brainiac to lay claim to a number of
- 00:23
his very own was German theoretical
- 00:26
physicist and life of every party Max [Max Planck wearing a party hat]
- 00:29
Carl Ernst Ludwig Planck. This guy had
- 00:33
almost as many brilliant ideas floating
- 00:35
around in his head as he had middle names.
- 00:37
Planck's Constant, the number that
- 00:39
totally put him on the map,
- 00:40
is 6.6262 x 10 to the -34 joule-seconds. [Plancks constant example]
- 00:46
We have to admit, that it's an awfully good number.
- 00:49
But what is this mysterious number and
- 00:52
what's so special about it? And what in
- 00:53
the name of all that is good and holy is
- 00:55
a joule-second? Yeah, we hear your cry. A joule-second
- 00:59
is not part of a diamond-encrusted wristwatch, although [Diamond wrist watch ticks]
- 01:02
if you'd like to get us one of those as a "thank you"
- 01:04
for teaching you about Max Planck,
- 01:06
well, we won't complain. All right, let's
- 01:08
break it down. A joule is a unit for [Definition of joule unit]
- 01:10
measuring energy, and a second is one-
- 01:13
sixtieth of a minute (you know, you knew
- 01:16
that one), so a jewel second is a unit of
- 01:19
energy over a certain span of time. Like
- 01:23
any great scientific constant worth its
- 01:25
salt, Planck's Constant is also
- 01:27
represented by a single letter in the
- 01:29
interest of simplicity. You can just [Planck's constant with the alphabet]
- 01:31
write the letter h instead of writing
- 01:33
out the entire thing. The alphabet says
- 01:36
"You're welcome." Okay, now what is this thing, and
- 01:38
why does it deserve take up valuable [Man's head opens and words go into his brain]
- 01:40
space in our brains? Well, in the course of
- 01:42
Planck's experiments, in which he was
- 01:44
trying to understand a little more about
- 01:46
atomic theory (in particular the question
- 01:48
of whether or not there is a continuous
- 01:50
fluid spectrum of energy), what Planck
- 01:52
discovered was that, no: energy was [Energy, Frequency and Velocity drinking coffee together]
- 01:55
something of an oddball in that department.
- 01:57
He proposed that energy instead came in
- 02:00
units called "quanta." Yep, the root of
- 02:03
the word quantum, which is the root of the
- 02:05
TV show title called Quantum Leap, which is [TV screen with the TV show Quantum Leap]
- 02:08
getting off topic... But Planck concluded
- 02:10
that the smallest possible unit of
- 02:11
energy was 6.62626 x 10 to the -34 joule-seconds,
- 02:16
and that's how he got himself his own number. If your're
- 02:19
feeling jealous of Mr. Planck and would
- 02:21
like a number yourself, well, 6.6262 x 10 to the -35 [Man holding news paper with Planck's constant on front page]
- 02:26
joule-seconds is totally available.
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