In 1675, Ole Rømer Measured the Speed of Light by

question 111

Multiple Choice

In 1675, Ole Rømer measured the speed of light by

• A) timing eclipses of Jupiter's satellites by the planet, which appeared to occur later when Earth was farther from Jupiter.
• B) opening a shutter on a lantern on a hilltop and measuring the time taken for light from an assistant's shuttered lantern to return.
• C) reflecting light from a mirror rotating at a known speed and measuring the angle of deflection of the light beam.
• D) measuring how long it took the light to reach Earth from stars located at different distances from Earth.

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