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Ạ dO ton cryc dqi vd hr6ng vd phia Tdỵ
B. dO lon cwc dqi vd hadng vi phia D6ng. C. dO ton cryc dqi vd habng vi phia Bdc.
D. d0 lon bdng kh6ng.
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nrit chai ld chi6u cita vecttv Ẹ Tt d6 ta th6y
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Ciu 4. Trong thi nghiQm Y-ang vi giao thoa
anh sdng, ,gu6n sdng phat ra anh sang don
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sdc' co bróc song ),. Tren mdn quan sdt, tAn
doan thdng A/N đi 20cm (vu6ng goc vbi hQ
van giao thoa) co 10 vdn tu;i, M vd ltr ld vi tri
cua hai vdn sang. Thay anh sdng tAn bing
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anh song dctn sac co bróc song )1 :l)t rhi
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tqi M ld vi tri ctia m6t van giao thoa, so van
sdng trAn doan MIV lilc ndy la
Ạ 5. B. 6. C.7. D.8.
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Mvd N ld hai v6n s6ng, n6n tr6n doan ndy c6 11 vAn s6ng. Vi vdy tr6n daan MN c6 10
khoing vdn s6ng, m6i khoeng h 2cm. Ta c6
kho6ng v6n shD s10 SUY fa lt : -lt = -Cm. á JJ
VQy s6 khodng vAn sdng tr€n MNbitg
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TrCn doan ltfiii co 7 vdn s6ng.
D6p 6tr C dirng. tr