Understanding Stellar Quantities

What is the primary unit used to measure the distance of stars from Earth?

• Kilometers

• Parsecs

• Astronomical Units

• Light years

How does brightness relate to the distance of a star?

• Brightness increases with distance

• Brightness is independent of distance

• Brightness decreases with distance

• Brightness is the same regardless of distance

What does Wien's Displacement Law help us determine about a star?

• Its temperature

• Its distance

• Its brightness

• Its luminosity

What is the peak wavelength of light emitted by Betelgeuse?

• 1000 nanometers

• 500 nanometers

• 828.6 nanometers

• 292 nanometers

Which constant is used in the Stefan-Boltzmann Law?

• Planck's constant

• Gravitational constant

• Coulomb's constant

• Stefan-Boltzmann constant

What assumption is made about stars when using the Stefan-Boltzmann Law?

• They emit no radiation

• They are transparent

• They are blackbody radiators

• They are perfect reflectors

What is the parallax angle of Sirius used in the calculations?

• 1.2 arc seconds

• 2.64 arc seconds

• 0.379 arc seconds

• 0.5 arc seconds

How is the distance to Sirius calculated from its parallax angle?

• By subtracting the angle from 1

• By adding the angle to 1

• By taking the inverse of the angle

• By multiplying the angle by 10

What is the calculated temperature of Sirius?

• 5000 degrees Kelvin

• 6000 degrees Kelvin

• 9930 degrees Kelvin

• 3500 degrees Kelvin

What is the significance of being able to calculate stellar properties from Earth?

• It allows us to travel to stars

• It is purely theoretical with no practical use

• It helps us understand the universe

• It is used for weather prediction