作者kkboy770628 (小新)
看板Physics
標題[問題] 新手學近代物理，霧煞煞><
時間Tue Oct 21 22:49:57 2008
1.Light strikes a plates in an evacuated chamber.The result is
that electrons are emitted from the plate P and collected by C
a) Inthe process a single photon gives up all its energy to a single
electron. The maximum possible kinetic energy of the photoelectrons,
(1/2)mv(max)^2 is related to the energy of a photo, hf,
by hf=(1/2)mv(max)^2+ψ . What is the physical meaning of ψ ?
b) Plot the relation between the current measured by A and the applied
voltage V at two light intensity I1 and I2 (I2>I1) . Discuss your curves
especially discuss why the current vanishes at the same applied voltage
V0 for both curves .
c) Discuss why an experimentalist can measure the Plank's constant from the
relation between V0 and f .
第一題是要問功函數的物理意義嗎??
不太會解釋說 ... 大大能夠指點迷津嗎
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1F：→ nightkid:就是一種能量障礙 跨越那個能量障礙 才能打出光電子 10/22 00:32
2F：→ kkboy770628:可以三題大概交我怎麼下手嗎 不太會做 ><" 10/22 00:55
3F：推 head109:最後推導出來為一條直線方程式，斜率可測h 10/22 01:26