本题目来源于试卷: Physics Unit24: Wave Nature of Light，类别为 国际高中通用物理
[单选题]
A He-Ne laser (632.8* s xvg1ub*ibfn; o0u. g(j(c2*dqcaz ;3fm(:bfabf, iprgn9/0e /y gp d z3rw nm) is used to calibrate a grating. If the first-order maximum occurs at fny(9p3ebdgp,frmb /0;ziw a:3gf/ r$20.5^{\circ}$, what is the grating constant (the distance between the slits)?
A. $1.81 \; mm$
B. $2.20 \; mm$
C. $3.62 \; mm$
D. $4.52 \; mm$
参考答案: A
本题详细解析:
暂无
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