Speed of Light

What is the most accurate measured value of the speed of light?

• 3 x 10⁸ m/s

• 186,000 miles/s

• 299,792,458 m/s

• 300,000 km/s

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Which scientist used a cogged wheel to measure the speed of light?

• Hippolyte Louis Fizeau

• Christian Huygens

• Olaf Romer

• Leon Foucault

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What method did Hippolyte Louis Fizeau use to measure the speed of light?

• Time of flight method

• Distance of flight method

• Cogged wheel method

• Spinning mirror method

What device did Leon Foucault use to measure the speed of light?

• Spinning mirror

• Cogged wheel

• Orbit of Jupiter's moon Io

The speed of light in space is closest to

• 340 m/s

• 300,000 m/s

• 300,000,000 m/s

• Infinite

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The speed of light is

• 30,000 km/s

• 300,000 km/s

• 30,000 mi/ s

• 300,000 m/s

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How is the speed of light calculated using the travel time and Earth's orbit distance?

• speed of light = distance / time

• speed of light = time / distance

• speed of light = distance x time

• speed of light = time x distance

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How does the speed of light in water compare to its speed in air?

• The speed is the same in water because it is constant in all mediums.

• The speed is faster in water than in air because the molecules are closer together.

• The speed is slower in water than in air because the molecules are closer together.

• The speed cannot be compared without knowing the temperature.

Answer explanation

Electromagnetic waves travel faster in LESS DENSE mediums.

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(SC.7.P.10.4) Electromagnetic Wave Speed

Who was the first person to measure the speed of light?

• Galileo Galilei

• Isaac Newton

• Ole Roemer

• Christiaan Huygens

Who performed the most famous experiment measuring the speed of light in 1880?

• Isaac Newton

• Albert Einstein

• Albert Michelson

• Niels Bohr