GiaiTheo dinh luat quang dien, khi c6 hien tiigrng quang dien xay ratrong
te bao quang di?n, dong nang ban dau ciic dai ciia cac quangelectron hoan toan khong phu thuoc vao ciicfng do anh sang kich thichma chi phu thuoc vao budfc song
va tan so.Vdy chgn dap an C.Cdu 39: Tai hai diem A[r]