A metal surface illuminated by 8.5×1014 Hz light emits electrons whose maximum energy is 0.52 eV. The same surface illuminated by 12.0×1014 Hz light emits electrons whose maximum energy is 1.97 eV. The work function of the metal is ( B )
举一反三
- 在气体放电管中，用能量为12.1 eV的电子去轰击处于基态的氢原子，此时氢原子所能发射的光子的能量只能是 A: 12.1 eV． B: 10.2 eV． C: 12.1 eV，10.2 eV和 1.9 eV． D: 12.1 eV，10.2 eV和 3.4 eV．
- In<br/>a strain ellipsoid for rock deformation, the maximum strain axis is<br/>parallel to() A: the<br/>maximum flattening surface B: the<br/>maximum tensile surface C: the<br/>maximum stretching direction of minerals D: the<br/>maximum shearing surface
- An electric current is the flow of ___________. A: sort B: stream C: energy electrons D: electrons
- In the title of the text “The Light of Depression”, “light” may NOT be interpreted as ____ A: the lights of the city B: the light of a new experience C: the light that painted color into her life D: the light that illuminated her life
- An X-ray tube operates at 100 kV. The maximum speed of electrons striking the anticathode is ( )