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  4. Astronomical unit (Au) is the average distance between the earth and sun approximately 1.5 × 108 km. The speed of light is about 3.0 × 108 m / s. The speed of light in astronomical unit per minute is

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Q. Astronomical unit $(Au)$ is the average distance between the earth and sun approximately $1.5 \times 10^{8} \,km$. The speed of light is about $3.0 \times 10^{8} \,m / s$. The speed of light in astronomical unit per minute is

AMUAMU 2015Physical World, Units and Measurements

Solution:

Average distance between the earth and sun, is approximately $1.5 \times 10^{8} km$. Speed of light is $3.0 \times 10^{8} \,m / s.$
$\therefore $ Speed of light in astronomical unit per minute
$=0.12\, Au / \min$