GA VẬT LÝ 7 CN

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(dB) -Cha bi tõp 12.1: 12.2 12.1: B 12.2: n vi o ụ to cua õm l ờ xi ben (dB) Dao ụng cng manh thỡ õm phat ra (cng to) Dao ụng cng yu thỡ õm phat ra (cng nho) -HS2: Cha bi tõp 12.4, 12.5 -HS: GV: Ngyền Thị Thảo 35 Giỏo n Vt Lý 7 học: 2011 - 2012 Năm 2.Tễ CHC TINH HUNG HOC TP + Phng an 1: Ngy xa, ờ phat hiờn ting vo nga ngi ta thng ap tai xuụng õt ờ nghe Tai sao? +Phng an 2: Trong chin tranh cac chu bụ... bao): Ting ụn sõn trng vo khoang 70 dB-80dB -Yờu cõu HS tra li cõu hoi cung cụ: +ụ to, nho cua õm phu thuục nh th no vo nguụn õm? +n vi o ụ to cua õm l gỡ? C4: Ga manh dõy nõm to C5: M M -HS: (Trao ụi, tra li) m to (õm nho) thỡ biờn ụ dao ụng cua mng loa ln (nho)mng loa rung manh (rung nhe) -C7: Ting ụn sõn trng khoang 70 80dB -HS: GV: Ngyền Thị Thảo 34 Giỏo n Vt Lý 7 học: 2011 - 2012 Năm -GV (thụng... khac nhau 2.CUNG C: -m cao (õm bụng), õm thõp (õm trõm) phu thuục vo yu tụ no? -Tõn sụ l gỡ? n vi? C5: Võt dao ụng co tõn sụ 70 Hz dao ụng nhanh hnv võt dao ụng co tõn sụ 50 Hz phat ra õm thõp hn C6: Dõy n cng cng (cng nhiờu)dao ụng nhanhtõn sụ lnõm cao Dõy n trung (cng it)õm trõm C7: Cham ming phim phõn vnh ia ( xa tõm) khụng khi sau hng lụ dao ụng nhanh tõn sụ lnõm cao Cham ming phim xa vnh ia (gõn... mụt cach thu ụng: 1 iờm -Tham gia mụt cach chu ụng, tich cc co hiờu qua, Mt chu ụng thc hiờn cac thao tac thc hnh: 2 iờm Tng VI.RUT KINH NGHIấM: GV: Ngyền Thị Thảo 18 Giỏo n Vt Lý 7 học: 2011 - 2012 Năm Ngay soan: 27/ 9/2011 Tiờt: 7 GNG CU LI I.MUC TIấU: 1.Kiờn thc: -Nờu c tinh chõt anh cua võt tao bi gng cõu lụi -Nhõn bit c vung nhỡn thõy cua gng cõu lụi rụng hn vung nhỡn thõy cua gng phng co cung kich... phng an TN ờ chng minh c cng xa nguụn õm, biờn ụ dao ụng õm cng nhoõm cng nho II CHUN B : C lp: Tranh phong to hỡnh 13.4 Mụi nhom: 2 trụng, 2 qua cõu bõc, 1 nguụn phat õm dung vi mach kem pin III các HOT NG DY HOC *HOT NG 1: KIM TRA-Tễ CHC TINH HUNG HOC TP 1.KIM TRA: -HS1: Hay nờu ụ to cua õm phu thuục -HS:+ m phat ra cng to khi biờn ụ cua vo nguụn õm nh th no? n vi o ụ nguụn õm cng ln to cua õm? +n vi... ụng nh th no ? +Go nhe: õm nhoqua bonh dao ụng vi biờn ụ nho +Go manh: m toqua bong dao ụng vi biờn ụ ln C3: Qua cõu bõc lờch cng nhiờu (it), chng to biờn ụ dao ụng cua mt trụng cng ln (nho), ting trụng cng to (nho) -HS: Kờt lun: m phat ra cng to khi biờn ụ dao ụng cua nguụn õm cng ln -Yờu cõu HS hon thnh C3 (3 HS tra li cõu hoi, chu y HS yu) -Qua cac TN, yờu cõu HS t hon thnh tr 35 ? n vi o ụ to cua... (nhanh), õm vo chụ trụng hon thnh kt luõn tr 32 phat ra (cao) -Goi 3 em oc kt luõn *Kờt lun: Dao ụng cng nhanh (chm), tõn sụ dao ụng cng ln (nh) õm phat ra cng cao (thp) *HOT NG 4: VN DUNG-CUNG C-HNG DN V NHA 1.VNDUNG:-Yờu cõu HS oc C5, tra li -Yờu cõu HS trao ụi C6 trong 1 phut -Hng dõn HS tra li C7, kiờm tra bng TN v yờu cõu HS giai thich *GV chu y: Co 3 loai õm phat ra o l: +Ting cua ming nha cham... cua mụt võt tao bi gng phng: GV: Ngyền Thị Thảo 24 Giỏo n Vt Lý 7 học: 2011 - 2012 Năm A Ln hn võt C Nho hn võt B Bng võt D.Gõp ụi võt 5.( 2 iờm) nh cua mụt võt tao bi gng cõu lụi: A Nho hn võt C Bng võt B Ln hn võt D.Gõp ụi võt 6.( 2 iờm) nh ao cua mụt võt tao bi gng cõu lom: A.Nho hn võt C Ln hn võt B Bng võt D.Bng na võt Tiờt 10: Ngay soan: 17/ 10/2011 KIM TRA I MUC TIấU -Kiờm tra viờc nm bt kin thc... bang SGK tr 31 -HS: +Sụ dao ụng trong 1 giõy goi l tõn sụ +n vi tõn sụ l Hec (Hz) -HS: -HS: 1 phut iờn vo phõn nhõn xet, tham gia phat biờu trờn lp -HS: Dao ụng cng nhanh, tõn sụ dao ụng cng ln *HOT NG 3: GV: Ngyền Thị Thảo 30 Giỏo n Vt Lý 7 học: 2011 - 2012 Năm NGHIấN CU MI LIấN Hấ GIA CAO CUA M VI TN S II.M CAO (M BễNG), M TRM ( M THP) TH NGHIấM 2: -Yờu cõu HS cac nhom lm TN theo hỡnh -HS: Lm TN . 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