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The Big Bang Theory and The Steady State Theory both try to explain how the universe began (or existed). Below are 3 pieces of evidence. Match the piece of evidence to the theory that it supports.

(2 points)
Big Bang Theory Steady State Theory
Galaxies are moving outward from a central point.

Cosmic radiation levels were predicted by this theory before they were detected.

Scientists have not found objects older than 14 billion years.

3 answers

Here’s how the pieces of evidence match to the theories:

Big Bang Theory:

  • Galaxies are moving outward from a central point.
  • Cosmic radiation levels were predicted by this theory before they were detected.
  • Scientists have not found objects older than 14 billion years.

Steady State Theory:

  • None of the provided pieces of evidence directly support the Steady State Theory.

The evidence listed primarily supports the Big Bang Theory, while the Steady State Theory has largely been overtaken by the Big Bang Theory due to the lack of supporting evidence.

Platelets and red blood cells are components of the blood. A typical platelet and red blood cell have diameters of approximately 2.33×10^−6 m and 0.0000075 m, respectively. Which blood component has a bigger diameter, and approximately by how much?(1 point)

To compare the diameters of a typical platelet and a red blood cell, let's first express both measurements in the same scientific notation format:

  • Diameter of a platelet: \(2.33 \times 10^{-6} , \text{m}\)
  • Diameter of a red blood cell: \(0.0000075 , \text{m} = 7.5 \times 10^{-6} , \text{m}\)

Now we can compare the two values:

  • Diameter of a red blood cell: \(7.5 \times 10^{-6} , \text{m}\)
  • Diameter of a platelet: \(2.33 \times 10^{-6} , \text{m}\)

To find the difference in diameter, subtract the diameter of the platelet from that of the red blood cell:

\[ 7.5 \times 10^{-6} , \text{m} - 2.33 \times 10^{-6} , \text{m} = (7.5 - 2.33) \times 10^{-6} , \text{m} = 5.17 \times 10^{-6} , \text{m} \]

Thus, the red blood cell has a bigger diameter than the platelet, approximately by \(5.17 \times 10^{-6} , \text{m}\) or \(5.17 , \mu m\).