ACT Science Practice Question #1798 (Hard (580)) | Test Citadel
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ACT Science Difficulty: Hard (580)

Digital ACT Science Practice Question #1798

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According to Einstein's photoelectric equation (KE_max = h*f - Phi), increasing the frequency of incident light above the threshold causes: 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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KE_max increases linearly with frequency.

Masterclass Solution & Distractor Trap Analysis

KE_max = hf - Phi is a linear equation with slope h (Planck's constant)....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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