Gravitational radiation has been looked for in various ways by physicists for a

Question

Gravitational radiation has been looked for in various ways by physicists for a century after its prediction by Einstein in 1915. It was finally detected on September 14, 2015. What is the principle of the detector that was used to observe such radiation?

1. The observatories were hugely scaled-up Michelson interferometers.

2. None of these

3. Gravitational radiation is almost identical to infrared radiation, but travels at a very different speed, two times the normal speed of light, so the detectors had to measure both frequency and speed

Explanation / Answer

Gravitational waves travel at the speed of light hence option (3) is ruled out.

Since gravitational waves are very hard to detect, so the observatories were made in the form of hugely scaled up Michelson interferometers( laser interferometers). Hence option (1) is correct.

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