Trng: THPT Phan Bi Chu, Di Linh T: Vt l- Cng ngh H v tn:

BO CO THC HNH TH NGHIM VT L -------------------------------o0o-------------------------------BI THC HNH S 4:

XC NH BC SNG CA NH SNG Nhm:Lp: 12 im s: Nhn xt:

I. MC CH TH NGHIM 1) Quan st hin tng giao thoa nh sng qua khe I-ng 2) o bc sng Laze. 3)...................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... II/ C S L THUYT: Tr li cc cu hi sau y: Giao thoa l g? M t th nghim giao thoa Y-ng vi nh sng n sc; nh sng trng; Vit cc cng thc lin quan n phng n th nghim ny?

......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ..........................................................................................................................................................III. TIN HNH TH NGHIM - KT QU: 1. Xc nh bc sng ca nh sng , nh sng xanh v nh sng....................................................... a) B tr th nghim I- ng iu chnh cho chm sng chiu vo mt trong hai khe I-ng ( Khe I- ng l mt bn c gi vi 2 hoc 3 h thng : a = . mm, a = .. mm v a = mm ) ta s quan st D c h vn giao thoa trn mn. Khong vn trn mn c tnh theo cng thc i = . Xc nh D a ia ( cho D khong 0,5 m n 1,0m ), o c i, ta s tnh c bc sng theo cng thc = . D b) Xc nh khong cch gia N vn sng trn mn, hoc t l suy ra i = ( N l s vn sng hoc ) tnh c . N 1 c) Xc nh cc s liu ghi vo bng s liu sau: i Ln o D1 D2 D3 i1 i2 i3 D i D (m) ( knh lc .) (m) (m) (m) (mm) (mm) (mm) (mm) (mm) (m) mu a = mm mu a = mm mu a = mm d) Xc nh : Bc sng : = i D m a.i ); tr s: = ( m ) ( m) ; sai s = + ( D i D

1 = ............................. ................( m) - Bc sng nh sng mu : 2 = ............................. ................( m) - Bc sng nh sng mu : 3 = ............................. ................( m) - Bc sng nh sng mu : e) So snh kt qu o trong 3 ln th nghim: .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... 2. Kho st giao thoa chm nh sng trng v gii thch: a) M t h vn giao thoa vi chm nh sng trng. Gii thch: .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... b) M t s thay i h vn giao thoa khi D thay i. Gii thch: .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... 3. Xc nh bc sng ca nh sng laze. a) Tin hnh cc bc tng t nh mc 1: b) Xc nh cc s liu ghi vo bng s liu sau:Ln o 1 2 2 c) Kt qu: i D a.i = ..............................( m) ; sai s: = + = ...........................( m) D i D + Kt qu: = = ...................................... ...........................( m) d) Nhn xt: .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... IV: KIN THC V K NNG:( Ghi li nhng kin thc v k nng m bn thn thu nhn c ) .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... .......................................................................................................................................................................... + Gi tr : = Di Linh: ngy. thng.. nm 20 Ngi vit bo co(Ghi r h tn v k)

D (m)

l (mm)

N

i (mm)

=

ai D