Absolute magnitude (AQA A-Level Physics): Quizzes

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Absolute magnitude
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What does absolute magnitude MM measure?

Star's brightness at 10 pc from Earth

At what distance is absolute magnitude defined?

10 parsecs

What does apparent magnitude mm depend on?

Luminosity and distance from Earth

In m−M=5log⁡(d10)m - M = 5 \log \left(\frac{d}{10}\right), what units must dd be in?

Parsecs

What does a greater parallax angle indicate?

The star is closer to Earth

What is the definition of one parsec?

Distance at which 1 AU subtends 1 arcsec

What is the value of 1 AU?

1.50×10111.50 \times 10^{11} m

How many light-years equal one parsec?

3.26 light-years

In d=1θd = \frac{1}{\theta}, what units must θ\theta be in for dd in parsecs?

Arcseconds

What does the parallax method measure?

Star's distance via position shift

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