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B1 中級 英語 4:12 Educational

Heisenberg's Uncertainty Principle Explained

Veritasium · 2,680,349 回視聴 · 追加日 3日前

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00:01

Today I am doing an experiment that demonstrates Heisenberg’s Uncertainty Principle.

00:05

Sao her I have a green laser and I am firing it down towards the front of the room through

00:11

a narrow slit.

00:12

Now that slit can be adjusted so it can be made narrower or wider.

00:16

And the laser spot is projected on to a screen behind it.

00:20

So what do you think is going to happen to this spot on the screen as I narrow the slit?

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Well, let’s have a look.

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You see exactly what you would expect.

00:29

The spot gets narrower and narrower.

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The sides are getting cut off by the slit.

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It makes complete sense.

00:35

And if you stop there you would never realize that Heisenberg’s Uncertainty Principle

00:40

is at work.

00:41

But if you keep going something strange happens.

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