ACT Science Practice Question #1533 (Foundational (28)) | Test Citadel
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ACT Science Difficulty: Foundational (28)

Digital ACT Science Practice Question #1533

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

An astronomical catalog classified four stars on the Hertzsprung-Russell (H-R) diagram: - Star W (Spectral class O, Temp = 35,000 K): Luminosity = 100,000 L_sun - Star X (Spectral class G, Temp = 5,800 K): Luminosity = 1 L_sun - Star Y (Spectral class M, Temp = 3,000 K): Luminosity = 10,000 L_sun (Red Supergiant) - Star Z (Spectral class B, Temp = 20,000 K): Luminosity = 0.01 L_sun (White Dwarf) Which star has the highest surface temperature?
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35,000 K is the highest temperature in the table (Star W).

Masterclass Solution & Distractor Trap Analysis

Star W has a surface temperature of 35,000 K, the highest of the four stars....

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

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