[試題] 97下 黃暉理 普物甲下 第四次小考
課程名稱︰普通物理(甲)下
課程性質︰大一共同必修
課程教師︰黃暉理
開課學院：生農學院
開課系所︰生物產業機電工程學系
考試日期（年月日）︰2009/5/27
考試時限（分鐘）：50 minutes
是否需發放獎勵金：Yes
（如未明確表示，則不予發放）
試題 :
1.Two isotropic point sources of light (S1 and S2) are seperated by distance
3.0μm along a y axis and emit in phase at wavelength 900 nm and at the same
amplitude. A light detector is located at point P at coordinate Xp onthe x
axis. What is the greatest value of Xp at which the detected light is minimum
due to destructive interference? (30%)
y
↑
∣
S1∣ P
──●─────●───→x
│
│
│
S2●
│
│
2.Light of wavelength 550 nm is incident normally on a diffraction grating.
Twoadjacent maxima occur at angles given by sinθ = 0.2 and sinθ = 0.3.
The forth-order maxima are missing. (40%)
(a) What is the separation between adjacent slits ?
(b) What is the smallest slit width this grating can give ?
(c) For that slit width, what are the largest, second calus of the order
number m of the maxima produced by the grating ?
3.Sally rides in a train moving with constant valocity v relative to a station
and conduct a light pulse experiment. She sendsout a light signal and measure
the time interval when the signal reflacts back, donating the time interval
measured as ΔT0. Sam who stands on thet station platform as the train passes
also observes the same ongoing experiment. The same time interval Sam
measured is ΔT.
(a) Deduce the relation between ΔT0 and ΔT.
(b) What is the conclusion drawn from this observation ?
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06/08 18:16, , 1F
06/08 18:16, 1F