Thiết kế bài giảng vật lí 12 nâng cao (tập 2) phần 2

CHL/ONG VH Ll/pNG TLf ANH SANG BAI43 HlfiN TI/CfNG QUANG D I £ N N G O A I cAc DINH LUAT Q U A N G DifiN I-MUCTl£u Vi kie'n thflc - Hieu va nhd dupe eac khai niem: hian tupng quang dipn, aiectron quang dian, ddng quang didn, gidi ban quang dipn, ddng quang dian bao hoa, hiau dian thd ham - Hidu dupe npi dung va nhan xet ka't qua thi nghiam khao sat dinh lupng hian tupng quang dien - Hidu va phat tridn dupe edc dinh luat quang dian 2, Vi ki nSng - Ren luyan ki nang giai thieh cae hipn tupng vat li - Ren luyan ki nang phan tich ka't qua thi nghiem II - CHUXN BI Gido vien - Ve hinh 43.1,43.2,43.3 va 43.4 SGK tran gia'y khd AQ Hoc sinh - 6n lai cac kidn thflc vd cdng eua lye dian trudng, dinh 11 dpng nang, khai niam cudng dp ddng dien bao hoa 130 m - THifiT K£ H O A T D N G DAY HOC Hoat ddng cua hoc sinh Trp giup cua giao vi§n Hoat ddng Kidm tra, chuan bj dieu kien xua't phat Dat van de HS suy nghl ca nhan tim cau tra ldi GV nau cau hdi kiem tra kidn thflc cu - Lam thi nghiem vdi didt chan khong theo so dd sau : - Khi catdt bi ddt ndng, cae electron ty kim loai nhan dupe nang lupng edn thiet dd bflt khdi mat catdt Do dd, dng chan khdng cae electron ty chuydn dpng hdn loan Khi khoa K2 ddng, andt dupe ndi vdi cue ducfng, catdt dupe ndi vdi eye am cua ngudn dian thi eac electron se chuyen dpng tfl catdt sang andt tao ddng dipn Khi sd chi cua miliampe ke khae khdng Ddt ndng catdt bang ngudn dian ^i, sau dd md K], ddng K2 thi miliampe kd chi the nao ? Tai ? - Khao sat sy phu thupc cua cudng dp ddng dian chan khdng vao hipu dien the U dat gifla andt va catdt ngudi ta thu dupe dudng dac tuydn vdn-ampe I O u u 131 - Cudng dp ddng dian dd dat gia tri bao hoa Nhan xet gi vd cudng dp ddng dian TT V, TT V>U^'7 Hoat ddng Tim hieu hien tupng quang dien ngoai HS chu y lang nghe va tra ldi eau hdi cua GV GV md ta thi nghiam phat hian hian tupng quang dian nha vat li ngudi Dfle, Hee da lam, yau cdu HS ldng nghe va tra ldi cac cau hdi dd tim hidu hian tupng quang dien ngoai t - Do tia tfl ngoai chieu vao tdm kem nan lam cho aiectron bi bat khdi ta'm kem Khi dung tam thuy tinh khdng mau chan chum tia tfl ngoai thi khdng hai la dien nghiem khdng bj khep lai vi ta'm thuy tinh da hdp thu hdu het eac tia tfl ngoai HS tiep thu, ghi nhd - Chieu anh s ^ g uu qud7!| vao mpt tdm kem P ban ddu tich dien am thi hai la eua dian nghiem khep lai - Chdn chum tia hd quang bang tdm thuy tinh khdng mau thi hai la eua dian nghiem khdng bi khep lai Giai thich tai ? GV thong bao - Hian tupng anh sang lam bat eac aiectron khdi bd mat kim loai gpi la hian tupng quang dien ngoai, thudng gpi tat la hien tupng quang dien - Cac eletron bj bat khdi bd mat kim loai bj chieu sang gpi la quang aiectron, hay cdn gpi la aiectron quang dien 132 Hoat ddng Tim hieu thi nghiam khao sat dinh lupng hien tupng quang dien HS chu y ldng nghe va quan sat hinh ve te bao quang dian tran gidy khoAo GV gidi thiau te bao quang dien thi nghiem khao sat djnh lupng - Td bao quang dien la mpt binh bang thach anh da hut hdt khdng khi, ban cd hai dien eye: andt la mpt vdng day kim loai; catdt cd dang mpt chdm cdu bang kim loai ma ta edn khao sat GV md ta thi nghiam vdi td bao quang dien, yau cdu HS tra ldi cac cau hdi dd tim hieu thi nghiem khao sat dinh lupng hian tupng quang dipn D nF ^•0 O B P Ml - Khi chidu chum sang cd budc sdng ngdn vao catdt thi hien tupng quang dien ngoai xay ra, td bao quang dipn xudt hien cac aiectron quang dian Dudi tac dung ciaa lye dian trudng, cae aiectron Q - Ddng khoa C va di chuyen chay B dd U^i^ >0 Chia'u chum sang cd budc sdng ngan vao catdt thi hipn tupng gi xay ? Nhan xet gi ve sd ehi cua dien kdG? 133 quang dien chuyen dpng tfl catdt sang andt tao ddng dien chay mach Kim dien kd G Ipch khdi vi tri - Didu kian dd xay hien tupng quang dipn la anh sang chieu tdi ban kim loai cd budc sdng phai nhd hon hoac bang mpt gia tri XQ nao dd - Dung cac kinh loc sac F khae thi thdy ddng quang didn chi xudt hian anh sang chidu vao catdt cd budc sdng nhd hon hoac bang tri sd XQ Vay, didu kian de xay hiph tupng quang dipn la gi ? - Vdi mpt chum sang don sdc ed budc sdng va cd cudng dp sang nhdt X