oscillate

US

・

UK

B2 中高級

v.i.不及物動詞徬徨；猶豫；擺動；振動；使振動；使動搖

Their heads oscillate as they watch the tennis ball go back and forth

影片字幕

音樂的物理學。物理速成班第19期 (The Physics of Music: Crash Course Physics #19)

10:35

音樂的物理學。物理速成班第19期 (The Physics of Music: Crash Course Physics #19)

The points of a standing wave that don’t oscillate are called nodes,
定波中維持不動的點叫做波節(node)
So the peaks are the antinodes, and the points that don’t oscillate are nodes.
頂點就是波腹，不動的點就是波節

總是嫌另一半太黏人嗎？黏人其實是件好事！(Why being needy is good)

04:10

總是嫌另一半太黏人嗎？黏人其實是件好事！(Why being needy is good)

I have no qualms with enthusiastically expressing the pendulum of extreme emotions I oscillate between throughout the day.
我會毫不遲疑地熱情表達我一天之中所經歷的起伏不定極端情緒。

「夢」可以錄起來嗎？ (Could We Record Our Dreams?)

03:55

「夢」可以錄起來嗎？ (Could We Record Our Dreams?)

These waves oscillate at around 10 to 100 cycles per second.
這些波以每秒 10 到 100 次的頻率振動。
Radio waves, on the other hand, oscillate at around 50 million to 1 billion times per second.
另一方面，無線電波每秒振動的頻率大約是五千萬次到十億次。

完美的下半身活動套路（只需 5 分鐘） (The Perfect Lower Body Mobility Routine (You Only Need 5 Minutes!))

14:59

完美的下半身活動套路（只需 5 分鐘） (The Perfect Lower Body Mobility Routine (You Only Need 5 Minutes!))

And you can either hold it here, or sometimes I like to oscillate back and forth.
你可以按住這裡，有時我喜歡來回擺動。
Now, I like the box because you can kind of grab on tight and use it as leverage to drive down, but you can either go like in repetitions where you oscillate back and forth, or you can just hold this bottom position.
現在，我喜歡這個箱子，因為你可以緊緊抓住它，利用它作為槓桿向下推動，但你既可以像重複那樣來回擺動，也可以保持這個底部位置。

真實性已經死了嗎？ (is authenticity dead?)

05:30

真實性已經死了嗎？ (is authenticity dead?)

[Anna]: With sharing, I've oscillate a lot between...
[安娜]：與共享，我已經搖擺了很多之間... ...

如何用外星人建造一個傳送器 (How to Build a Teleporter with Aliens)

03:51

如何用外星人建造一個傳送器 (How to Build a Teleporter with Aliens)

, and wait for that photon to oscillate 9,192,631,770 times: that's what we call one second.
，並等待該光子振盪9,192,631,770次：這就是我們所說的一秒鐘。

地震101 | 國家地理雜誌 (Earthquakes 101 | National Geographic)

05:02

地震101 | 國家地理雜誌 (Earthquakes 101 | National Geographic)

Seismographs oscillate drawing a jagged line to reflect this movement.
地震儀振盪時畫出一條鋸齒狀的線來反映這種運動。

3.8 菲涅爾方程 (3.8 Fresnel Equations)

23:07

3.8 菲涅爾方程 (3.8 Fresnel Equations)

This is not an equal sign this essentially says the in the complex index of refraction Essentially is related to alpha and beta, but is not equal to alpha and beta So let me just clarify that since that's a mistake in the slide Now if the material is very lossy or if it's something like a metal then then most of the incident radiation is going to be Reflected, but if it's a dielectric material then the transmitted wave which essentially has a k vector K sub T here is coming in a different angle So theta sub T is not necessarily equal to theta sub I or theta sub R the transmitted wave goes in a different direction than the incident wave and the reflected wave and We can calculate the angle of that transmitted wave using something called Snell's law, which is given right here that the the Index of refraction in I of the wave coming in times the sine of the incident angle incident angle is equal to the index of refraction for the material the waves getting transmitted into times the angle of the Transmitted wave so if we know in sub I in sub T and the incident angle theta we can do a simple algebraic manipulation to calculate the angle of transmission And so those really are the basics of waves and incident on surfaces if you understand these basics the rest of it Although there are some long equations follows pretty straightforwardly now the first complication we run across is that the Reflection and transmission that we see depend on the direction of the electric field And so the first direction of electric field we're going to talk about is called s or perpendicular Polarization and the way we we define this is we think as we've talked about before of a plane of incidence and this plane of incidence is the plane that contains both the incident and the In the plane of incidence the normal to the surface lies in the plane of incidence and if the electric field is sticking up out Of the plane of incidence so there's essentially a 90-degree angle Between the electric field and the plane of incidence then we call it s or perpendicular polarization where perpendicular means It's perpendicular to the plane of incidence Now if the electric field is perpendicular to the plane of incidence We can calculate the magnitude of the reflected field and the transmitted field given the magnitude of the incident field so essentially this incident field is going to come in like this some of its going to bounce off and there will also be an electric field pointing in the same direction that we're going to call e Sub r or the reflected field and the relationship between the incident field e sub i Right here and the reflected field e sub r right here is The reflected field and notice we have this little perpendicular sign that says it's perpendicular to the plane of incidence is equal to the coefficient r perpendicular times the the incident field and Essentially without deriving it the reflection coefficient for perpendicularly or s polarized radiation is given by this it depends both on the incident index of refraction the index of refraction of the material that the waves reflecting from are getting transmitted into and the cosine of both the incident angle and The angle the waves being transmitted at and remember Snell's law says in sub i sine of theta sub i is Equal to the index of refraction of the material that the waves getting transmitted into Times the sine of that angle and so we calculate theta sub t from this equation right here So overall this gives the reflected field Once we know all of these things similarly, there's going to be an electric field pointing in the same direction That's transmitted into the material We can call it e sub t here and the relationship between the transmitted field and the incident field is given by a very similar expression, but we use the term t perpendicular for the We find it depends on the incident and transmitted indices of refraction the incident and transmitted angles And if we plug it into this equation, we'll know what fraction of the electric field gets transmitted in other words the ratio Between the incident field the magnitude of the incident field on the transmitted field and because they're vectors the vectors are going to point in the same direction Now I'm using a lot of Lines here, but we have to remember that these are actually waves coming in as shown in the bottom figure down here So they oscillate up and down and they're plane waves So we assume that everywhere on these planes that are represented by these little green squares The electric field is a vector field the vectors all point in the same direction But that direction can vary with time and space as we saw in previous talks And again, the angles are just given by the K vectors K incident K transmitted K reflected we have exactly the same situation or very close to the same situation if the Notice that instead of the electric field pointing up and down like before Perpendicular to the plane of incidence now the electric field lies in the plane of incidence and we call this P or parallel polarization Because the electric field is in the plane of incidence.
這不是一個等號，本質上說的是復折射率，本質上與α和β有關，但不等於α和β，所以讓我澄清一下，因為這是幻燈片中的一個錯誤、我們可以利用斯涅耳定律來計算透射波的角度、是以，如果我們知道子 I 子 T 和入射角度 theta，我們就可以通過簡單的代數運算來計算透射角。所以我們要討論的第一個電場方向叫做垂直極化，我們定義垂直極化的方法就是我們之前討論過的入射平面，入射平面是包含入射和透射的平面，表面的法線位於入射平面內。如果電場垂直於入射面，我們就可以根據入射場的大小計算出反射場和透射場的大小。入射電場會像這樣射

A 級物理：什麼是偏振？ (A Level Physics: What is polarisation?)

04:44

A 級物理：什麼是偏振？ (A Level Physics: What is polarisation?)

A wave is plane polarised if the particles or the electromagnetic field oscillate in a single plane only.
如果粒子或電磁場只在一個平面內振盪，那麼波就是平面極化的。
For instance, we could choose to oscillate this in the vertical plane, like so.
例如，我們可以選擇在垂直面上擺動，就像這樣。

普朗克常數與黑體輻射 (Planck's Constant and BlackBody Radiation)

08:59

普朗克常數與黑體輻射 (Planck's Constant and BlackBody Radiation)

And so as these electrons, as they oscillate back and forth, they can absorb and emit electromagnetic energy.
是以，當這些電子來回擺動時，它們可以吸收和發射電磁能。