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Units and Measurements — Physics STD 11 Science — Question

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

$1 \mathrm{~m}=1 / 9.46 \times 10^{15} \mathrm{ly}=1.06 \times 10^{-16} \mathrm{ly} \text { Distance }=\text { Speed } \times \text { Time Speed of light }=3 \times 10^8 \mathrm{~m} / \mathrm{s} \text { Time }=1 \text { year }=365$
$\text { days }=365 \times 24 \text { hours }=365 \times 24 \times 60 \times 60 \mathrm{sec} \text { Putting these values in above formula we get } 1 \text { light year distance }$
$=\left(3 \times 10^8 \mathrm{~m} / \mathrm{s}\right) \times(365 \times 24 \times 60 \times 60 \mathrm{~s})=9.46 \times 10^{15} \mathrm{~m} 9.46 \times 10^{15} \mathrm{~m}=1 \mathrm{ly} \text { So that } 1 \mathrm{~m}=1 / 9.46 \times 10^{15} \mathrm{ly}=1.06$
$\times 10^{-16} \mathrm{ly}$

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