# physics

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Suppose the Sun is 1.52669 × 108
km from
Earth.
The speed of light is 2.99792 × 108 m/s.
How long does it take for its light to reach
us?

• physics -

The speed of light in a certain material is 1.3 × 108 m/s. Express the speed of light in (a) feet per nanosecond (ft/ns) and (b) millimeters per picosecond (mm/ps).

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