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Delhi Police Constable Exam Model Paper 7
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© examsnet.com
Question : 50
Total: 100
Light-year is a measurement of:
Time in Space
Distance in Space
Speed of Satellites
Speed of Light
Validate
Solution:
Distance in Space
:
It is a unit of length used for
expressing astronomical distances
.
A light-year is a distance that light travels in a vacuum in a year.
It is used while
expressing distances to stars and other distancesm
on a galactic scale.
Space-Time
:
It is a mathematical model.
It merges the
three dimensions of space and the dimension of time
into a single four-dimensional manifold.
Speed of Light:
The speed of light in a vacuum is
denoted as constant c
.
It is a
universal physical constant
of physics.
Its value is
approximately 3x10^
8
m/s and exactly 299 792 458 m / s.
The speed at which light propagates through transparent materials, such as glass or air, is always less than c.
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