Find the de–Broglie wavelength of an electron with kinetic energy of 120 eV.
112 pm
95 pm
124 pm
102 pm
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When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2 λ, the stopping potential is 4/V. The threshold wavelength for the metallic surface is