ACT Science Practice Question #1799 (Hard (610)) | Test Citadel
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ACT Science Difficulty: Hard (610)

Digital ACT Science Practice Question #1799

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If the intensity (brightness) of the red light is increased tenfold, what effect will this have on electron emission? Experiment Context (Photoelectric Work Function of Potassium): Monochromatic light of varying frequencies was shone onto a clean potassium metal cathode in a vacuum phototube, and maximum kinetic energy of emitted photoelectrons was measured: Table 15: - Red Light (4.5 x 10^14 Hz): Photoelectrons emitted = None; Max KE = 0.00 eV - Yellow Light (5.2 x 10^14 Hz): Photoelectrons emitted = None; Max KE = 0.00 eV - Green Light (5.8 x 10^14 Hz): Photoelectrons emitted = Yes; Max KE = 0.12 eV - Blue Light (6.5 x 10^14 Hz): Photoelectrons emitted = Yes; Max KE = 0.41 eV - Violet Light (7.5 x 10^14 Hz): Photoelectrons emitted = Yes; Max KE = 0.82 eV
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Sub-threshold photons never eject electrons, regardless of brightness.

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Photoelectric emission is a one-photon-one-electron quantum process. Sub-threshold photons cannot eject electrons regardless of intensity....

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