... quang in. Cụng thoỏt ca kim loi lm catt A = 2, 25 eV. Vn tc cc i ca cỏcquang ờlectrụn bt ra khi cõtt l: A. 421 .105 m/s. B. 42, 1.105 m/s. C. 4 ,21 .105 m/s. D. 0, 421 .105 m/s.Cõu 5: Quang ... Trng THPT N THI KIM TRA VT Lí HC Kè II ( 12 CB) T TN 1 ( Nm hc: 20 09- 20 10)****Cõu 1 . Cng dũng quang in tựy thuc A. C 3 yu t trờn. B. Cng chựm tia ... 318,5Hz C. 20 00 rad/s D. 20 00HzCõu 9: Mt mch dao ng LC, cun dõy cú t cm L = 2mH v t in cú in dung C= 0 ,2 F. Cng dũng in cc i trong cun cm l I0 = 0,5A. Nng lng ca mchdao ng l.A.30 ,25 .10 J...