"Usher Yeah" 是 Usher 的歌曲 "Yeah!" 的中文翻譯版。以下是這首歌的歌詞：
Yeah! (Yeah!)
Yeah, yeah, oh
Verse 1:
Yeah, yeah, yeah, yeah
I'm on another level, I'm in a different zone
My mind is blown, I'm on a different zone
My girl got me feeling like a different man
Chorus:
Yeah! (Yeah!)
Yeah, yeah, oh
Come and take my hand
Let me show you what it is that I stand for
I'm all about that anthem
I'm in the club to dance
With my girl and my hat low, I'm all about that swag
Verse 2:
Yeah, yeah, yeah, yeah
Everybody got their eyes on me
But I ain't worried bout a thing, I'm on a high just being me
Got my girls with me just being fly
Got my head up and my mind clear
This is my time and I'm going for mine
Chorus:
Yeah! (Yeah!)
Yeah, yeah, oh
Come and take my hand
Let me show you what it is that I stand for
I'm all about that anthem
I'm in the club to dance
With my girl and my hat low, I'm all about that swag
Yeah! (Yeah!)
Yeah, yeah, oh oh oh
Oh oh oh oh oh oh oh
I got this (got this) I got this (got this) all about it!
So turn it up if you feelin it now (oh)
(Bring it on up bring it on up) to 11! (Oh)
Yeah! (Yeah!) Yeah, yeah, oh oh oh oh oh oh oh
Yeah! (Yeah!) Oh yeah, oh oh oh oh oh oh oh
(Get your hands up up up up up) Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! Hey! (Up up up up) Yeah yeah yeah yeah yeah yeah yeah yeah yeah yeah
Outro:
Oh, you feel it now? Oh you feel it now? (Bring it on up) You feel it now? (Bring it on up) Yeah now put your hands up high Yeah now let your body shine Yeah now bring the rhythm on down用光照射某金屬表面時發生了光電效應，若光強度不變，而頻率增加，單位時間內發射的光電子數減少，光電子的最大初動能如何變化？這種變化的原因是什麼？試說明原因。
解：由愛因斯坦光電效應方程$E_{km} = h\nu - W_{0}$可知，當光強度不變時，光子數密度不變，即單位時間內單位面積上的光子數不變；若光頻率增加，單位時間產生的光電子數會減少，同時電子的最大初動能會增加；增加頻率的光輻射是微觀體系中少數光子具有更大動量、速度和能量的表現。從一定意義上講，隨著輻射強度的增強，必然出現由於增加的光輻射部分超過在每個頻率範圍內的動量增益而導致該頻率輻射減少的情況。光強和頻率兩個物理量的增加不一定都會引起能量的變化，這是因為存在波爾茲曼分布這一事實，不同的光輻射處於不同的狀態中。這種能量的增加來源於使處在一定狀態的某部分體系得到比其它狀態的該部分體系更大的動量或能量，隨著光強和頻率的增加而得到的是頻率較低的額外動量。如果外界把具有特定能量的某個特定狀態的總和所吸收的光能給予系統的話，也可以在具有其他能量和狀態的系統中的一定範圍內使新電子達到同樣的狀態，從而導致總的光電子數的減少和能量的增加。由於不同的輻射體系狀態不同，因此能量增益也不同。因此，增加輻射強度和改變輻射頻率都會引起能量的變化。因此，光電子的最大初動能會增大。