GED® Science: Full-Length Practice Exam (Level 5 - Elite) › 2. Reasoning at the Highest Level
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2. Reasoning at the Highest Level

GED® Science: Full-Length Practice Exam (Level 5 - Elite) · preview lesson

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Elite science demands precise quantitative and evaluative thinking.

  • Square and cube relationships. Kinetic energy depends on the square of speed; doubling speed quadruples energy.
  • Conservation in collisions. Total momentum is conserved before and after a collision.
  • Inheritance probability. Dihybrid crosses give a 9:3:3:1 ratio; combine probabilities for specific outcomes.
  • Data vs. conclusion. Ask whether the evidence actually supports the claim, controls for confounding factors, and rules out chance.
  • Cosmic evidence. Redshift shows galaxies moving away -- evidence the universe is expanding.
How Far Is Space? Measuring Huge Distances Earth–MoonEarth–SunNeptunenearest star 1.3 light-seconds 1 AUlight: ~8 minutes ~30 AUlight: ~4 hours ~4.2 light-years Two space rulers: • AU (astronomical unit) = the average Earth–Sun distance (~150 million km). • Light-year = how far light travels in one year (~9.5 trillion km). Distances are so vast that astronomers measure them by how long light takes to cross them.
From atoms to galaxies, the same physical laws scale across the universe.
Quick Check

Galaxies show a redshift that grows with distance. What does this provide evidence for?

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