Galileo, in order to measure the speed of light, performed this simple experiment: He and his assistant each took a lantern that had a shutter in front of it, and stood on hilltops one mile apart in the night.
Galileo was to flash his lantern, and the assistant was to open the shutter of his own lantern as soon as he saw the light from Galileo's lantern. Galileo had planned to measure the time taken for light to travel from one hill to the other and back, and calculate the speed of light using the formula, Speed = distance travelled / time taken But he could not measure the speed of light using this method. What could have been the reason for this?
A. The distance between the two hills was too much for them to see the light from the other person's lantern.
B. Light does not travel in straight lines and so the distance travelled by it cannot be measured.
C. The time taken for the light to travel would have been too little to have been measured by them.
D. Light does not travel because it is present everywhere, so its 'speed' cannot be calculated
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Following is the reason for Galileo being unable to calculate the speed of light from the given experiment: the time taken for the light to travel would have been too little to have been measured by them. (Option-C)
- Being a wave, light can travel in a straight line, therefore options B and D are totally wrong.
- Moreover, shows the property of diffraction when it hits an obstacle.
- Light can travel at a very high-speed i.e 3 × 10⁸m/s in air, - later discovered by Roemer by timing eclipses of Jupiter moon.
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