ACT Science Practice Question #1830 (Hard (520)) | Test Citadel
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ACT Science Difficulty: Hard (520)

Digital ACT Science Practice Question #1830

Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.

Based on Table 26, which star is classified as a Red Supergiant? Experiment Context (Hertzsprung-Russell Stellar Data): Astrophysicists surveyed four representative stars, compiling surface temperatures (in Kelvin) and luminosities relative to the Sun (L_sun = 1.0): Table 26: - Star 1 (Betelgeuse): Surface Temp = 3,500 K; Luminosity = 100,000 L_sun; Spectral Class = M - Star 2 (Sun): Surface Temp = 5,800 K; Luminosity = 1.0 L_sun; Spectral Class = G - Star 3 (Sirius A): Surface Temp = 9,900 K; Luminosity = 25 L_sun; Spectral Class = A - Star 4 (Sirius B): Surface Temp = 25,000 K; Luminosity = 0.003 L_sun; Spectral Class = DA
Select Your Answer:
Socratic AI Engine Step-by-Step Derivation
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⚡ 15-Second Desmos Speed Hack

Cool temperature + extreme luminosity = Supergiant.

Masterclass Solution & Distractor Trap Analysis

Red supergiants have low surface temperatures (M-class, cool/red) but massive surface area producing immense luminosity....

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

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