A beam of parallel light of wavelength 500nm is incident normally on a diffraction with 5000 lines per centimeter. What is the maximumnumber of orders of fiffraction that can be seen on each side of the central (zeroth order) maximum on the far side of the grating?
A 2
B 3
C 4
D 5
E 6
F 7
Diffraction
2009-03-03 1:39 pm
回答 (1)
2009-03-03 3:57 pm
✔ 最佳答案
Wavelength, λ = 500 nm = 500 X 10^-9 mDiffraction grating separation, d = 0.01 / 5000 = 2 X 10^-6 m
By the equation:
mλ = dsinθ
m = dsinθ/ λ <= d / λ
m <= (2 X 10^-6) / (500 X 10^-9)
m <= 4
So, the maximum order that can be seen on each side of the central is 4.
The answer is C.
參考: Physics king
收錄日期: 2021-04-19 13:42:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090303000051KK00207