Exploring the Nature of Starlight

What is the primary source of starlight?

• Nuclear fusion in the star's core

• Chemical reactions on the star's surface

• Reflection of light from nearby planets

• Gravitational forces within the star

Which instrument is used to analyse the spectrum of starlight?

• Telescope

• Spectrometer

• Microscope

• Barometer

What is a light year?

• The time it takes for light to travel around the Earth

• The distance light travels in one year

• The time it takes for light to travel from the Sun to Earth

• The distance between the Earth and the Sun

Which of the following is a method of stellar classification?

• By the star's age

• By the star's size

• By the star's spectral type

• By the star's distance from Earth

What does redshift in starlight indicate?

• The star is moving towards us

• The star is stationary

• The star is moving away from us

• The star is increasing in brightness

What is the apparent brightness of a star as seen from Earth called?

• Luminosity

• Magnitude

• Intensity

• Radiance

Which of the following best describes blueshift?

• A decrease in the wavelength of light from a star

• An increase in the wavelength of light from a star

• A change in the star's brightness

• A change in the star's temperature

What is the unit of measurement for stellar distances within our galaxy?

• Miles

• Light years

• Metres

• Feet

Which spectral class of stars is the hottest?

• M

• K

• G

• O

What does the term 'absolute magnitude' refer to?

• The brightness of a star as seen from Earth

• The intrinsic brightness of a star

• The size of a star

• The distance of a star from Earth