Violet light with a wavelength of 430 nm falls on a sodium plate (W = 2.75 eV) and a potassium plate (W = 2.30 eV). Which of of the following statements is true?
A. Both plates emit electrons, but those emitted by the sodium plate have the larger kinetic energy.
B. Both plates emit electrons, but those emitted by the potassium plate have the larger kinetic energy.
C. Only the sodium plate emits electrons.
D. Only the potassium plate emits electrons.
E. Neither plate emits electrons.
B. Both plates emit electrons, but those emitted by the potassium plate have the larger kinetic energy.
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A. 4.0 keV B. 6.1 keV C. 10 keV D. 12 keV E. 15 keV
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