To find this angle, we first work out general algebraic expression for the range. 為求這一角度，首先我們求出射程的一般代數表達式。
Let us work out the time that would be taken for an atom to absorb the energy required to produce a photoelectron. 讓我們求出一個(gè)原子產(chǎn)生一個(gè)光電子吸收所需能量應該經(jīng)歷的時(shí)間。
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