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BPSC (Bihar) Exam  >  BPSC (Bihar) Questions  >  Light-year is a unit ofa)timeb)speedc)distanc... Start Learning for Free
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'Light-year' is a unit of
  • a)
    time
  • b)
    speed
  • c)
    distance
  • d)
    intensity of light
  • e)
    None of the above / More than one of the above
Correct answer is option 'C'. Can you explain this answer?
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Light-year is a unit ofa)timeb)speedc)distanced)intensity of lighte)No...
Light Year:
  • It is to used to measure distances in-universe. 
  • It is the distance travelled by a beam of light in a single Earth year.
  • It is approximately 6 trillion miles (9.7 trillion kilometres).
  • The speed of light is constant throughout the universe i.e: 3 x 108 ms-1.
  • Measuring in light-years also allows astronomers to determine how far back in time they are viewing. 
  • It can be divided into smaller units as light-hours, light-minutes or light-seconds.
  • According to the IAU, the light-year is the product of the Julian year (365.25 days) & the speed of light.
  • There are two other units to determine length, are used in astronomical studies:
The astronomical unit (AU):
  • The astronomical unit (AU) is the distance from the Earth to the Sun.
  • It is the shortest astronomical unit of distance.
  • The distance between the Sun & Earth changes throughout the year.
    • It is due to Earth’s orbit which is an ellipse.
    • It is approximately equal to 93 million miles.
  • Short distances between bodies within a solar system which is in fractions of a light-year, is expressed in astronomical units.
The parsec (pc):
  • The parsec (pc) is a unit of length used to measure distance in-universe.
  • It is the distance from the Sun to an astronomical object with a parallax angle of one arcsecond.
  • 1 parsec = 3.3 light years (approx.)
  • It is used to measure large distances in-universe.
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Light-year is a unit ofa)timeb)speedc)distanced)intensity of lighte)None of the above / More than one of the aboveCorrect answer is option 'C'. Can you explain this answer?
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Light-year is a unit ofa)timeb)speedc)distanced)intensity of lighte)None of the above / More than one of the aboveCorrect answer is option 'C'. Can you explain this answer? for BPSC (Bihar) 2024 is part of BPSC (Bihar) preparation. The Question and answers have been prepared according to the BPSC (Bihar) exam syllabus. Information about Light-year is a unit ofa)timeb)speedc)distanced)intensity of lighte)None of the above / More than one of the aboveCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for BPSC (Bihar) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Light-year is a unit ofa)timeb)speedc)distanced)intensity of lighte)None of the above / More than one of the aboveCorrect answer is option 'C'. Can you explain this answer?.
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