Which of the following statements is/are correct? 1. In June 2016, the LIGO group of scientists announced the detection of a second set of gravitational waves. 2. Gravitational waves were generated due to merger of two black holes at about 1-4 billion lig

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Q: 76 (CDS-I/2017)

Which of the following statements is/are correct?
1. In June 2016, the LIGO group of scientists announced the detection of a second set of gravitational waves.
2. Gravitational waves were generated due to merger of two black holes at about 1-4 billion light-years distant.
3. Gravitational waves were inserted due to collision of two white dwarf stars at about 1 -4 billion light-years distant.
Select the correct answer using the code given below.

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,23,63,3,38,7,38

keywords: 

{'gravitational waves': [0, 0, 0, 2], 'black holes': [0, 0, 0, 1], 'white dwarf stars': [0, 0, 0, 1], 'second set': [0, 0, 0, 1], 'ligo group': [0, 0, 0, 1], 'collision': [0, 0, 0, 1], 'detection': [0, 0, 0, 2]}

The correct answer is option 2, which states that only statements 1 and 2 are correct.

Statement 1 is correct. In June 2016, the LIGO (Laser Interferometer Gravitational-Wave Observatory) group of scientists announced the detection of a second set of gravitational waves. This was a significant discovery that confirmed the existence of gravitational waves as predicted by Albert Einstein`s general theory of relativity. The LIGO detectors recorded the gravitational waves for the second time, providing further evidence of their existence.

Statement 2 is also correct. The gravitational waves detected by LIGO were generated due to the merger of two black holes. The distance of the merger event was approximately 1-4 billion light-years away. This means that the gravitational waves took billions of years to reach Earth from the source.

Statement 3 is incorrect. Gravitational waves were not generated due to the collision of two white dwarf stars. Instead, they were generated by the merger of black holes, as mentioned in statement 2.

Therefore, the correct answer is option 2, stating that statements 1 and 2 only are correct.