作者kkboy770628 (小新)
看板Physics
标题[问题] 新手学近代物理，雾煞煞><
时间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 .
第一题是要问功函数的物理意义吗??
不太会解释说 ... 大大能够指点迷津吗
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1F：→ nightkid:就是一种能量障碍 跨越那个能量障碍 才能打出光电子 10/22 00:32
2F：→ kkboy770628:可以三题大概交我怎麽下手吗 不太会做 ><" 10/22 00:55
3F：推 head109:最後推导出来为一条直线方程式，斜率可测h 10/22 01:26