# The Physics of Astrophysics (Option E) Part 2

30 Questions covering 10.5 to 10.7 of HL Option (E) Astrophysics. Requires knowledge of Stellar Parallax, Magnitudes and Stellar evolution of stars as well as some equations and numbers related to these topics.

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## 1. The stellar parallax of a star is calculated from two observations made on the earth at least...?

• Every other year
• Two times in one year
• Once a year
• Once every 10 years
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• True
• False

## 3. The parsec is defined as...? Units are shown, followed by the conversion factor from degrees.

• 1/ The angle in degrees (1°) (1°/1)
• 1 / The angle in seconds (1') (1° / 60)
• The angle in degrees (1°) (1° / 1)
• The angle in seconds (1') (1° / 60)

## 4. The equation defining the arc of a circle s, is s = rθ, where θ is the angle in radians, r is the radius. What is the equation defining the distance (D) to a star under observation where A.U is one astronomical unit.

• D = A.U / θ
• D = 2A.U / θ
• D = A.U x θ
• D = A.U / 2πθ

• 10000pc
• 1000pc
• 100pc
• 10pc