GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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gravity does not have a speed, it is instantaneous
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at the speed of light
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slower than the speed of light
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None of the above
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Detailed explanation-1: -Kopeikin and Fomalont concluded that the speed of gravity is between 0.8 and 1.2 times the speed of light, which would be fully consistent with the theoretical prediction of general relativity that the speed of gravity is exactly the same as the speed of light.
Detailed explanation-2: -Fomalont and Kopeikin combined observations from a series of radio telescopes across the Earth to measure the apparent change in the quasar’s position as the gravitational field of Jupiter bent the passing radio waves. From that they worked out that gravity does move at the same speed as light.
Detailed explanation-3: -Through these observations alone, scientists determined that the speed of gravity was between 2.55 × 108 m/s and 3.81 × 108 m/s, completely consistent with Einstein’s predictions of 299, 792, 458 m/s.