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WorksheetsBrightness of Stars Review
Total questions: 15
Worksheet time: 15mins
The image below shows a star's luminosity as viewed from Earth. Decide if the star's luminosity is least luminous, more luminous, or most luminous.
least luminous
more luminous
most luminous
The image below shows a star's luminosity as viewed from Earth. Decide if the star's luminosity is least luminous, more luminous, or most luminous.
least luminous
more luminous
most luminous
Stars are natural bodies that give off their own _________________.
distance
far away
light
closer
What do scientists use because they cannot physically travel to a star to take its exact measurements?
apparent brightness
absolute brightness
apparent calculations
absolute calculations
Luminosity in measured in _____>
grams
meters
ohms
watts
What three factors are considered when discussing apparent brightness of a star?
time
distance
temperature
color
luminosity
What happens to brightness as distance increases?
As distance increases, the brightness stays the same.
As distance increases, the brightness increases.
As distance increases, the brightness decreases.
After the Sun, which star is the next brightest?
Nu2 Lupi
Tau Ceti
Alpha Centauri A
What is the term used to describe the intrinsic brightness of a star, independent of its distance from Earth?
Apparent Magnitude
Absolute Magnitude
Relative Brightness
Stellar Luminosity
Which unit is commonly used to express the luminosity of stars?
Joules
Watts
Lumens
Candela
If a star is twice as far away from Earth as another star of the same luminosity, how does its apparent brightness compare?
It is twice as bright.
It is half as bright.
It is one-fourth as bright.
It is the same brightness.
What instrument do astronomers use to measure the brightness of stars?
Telescope
Spectrometer
Photometer
Microscope
Which factor does NOT affect the apparent brightness of a star as seen from Earth?
Distance from Earth
Star's temperature
Star's size
Star's age
What is the relationship between a star's temperature and its color?
Hotter stars are redder.
Cooler stars are bluer.
Hotter stars are bluer.
Temperature does not affect color.
Which of the following stars would appear brightest in the night sky?
A star with high luminosity and far away
A star with low luminosity and close
A star with high luminosity and close
A star with low luminosity and far away
