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Units and Measurements — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsUnits and Measurements1 Mark
Question
Fill in the blanks by suitable conversion of units:
1m = ..... ly
✓

Answer

1m = 1/9.46 × 1015 ly = 1.06 × 10-16 ly
Distance = Speed × Time
Speed of light = 3 × 108 m/s
Time = 1 year = 365 days = 365 × 24 hours = 365 × 24 × 60 × 60 sec
Putting these values in above formula we get
1 light year distance = (3 × 108 m/s) × (365 × 24 × 60 × 60 s) = 9.46 × 1015 m
9.46 × 1015 m = 1 ly
So that 1m = 1/9.46 × 1015 ly = 1.06 × 10-16 ly

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