2017 · Q76
Which of the following statements is/are correct ?
- 1In June 2016, the LIGO group of scientists announced the detection of a second set of gravitational waves.
- 2Gravitational waves were generated due to merger of two black holes at about 1.4 billion light-years distant.
- 3Gravitational 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 :
General KnowledgeCurrent Affairs
- A1 only
- B1 and 2 only
- C2 and 3 only
- D1, 2 and 3
Explanation
On 15 June 2016 LIGO announced a second gravitational-wave detection (GW151226) from the merger of two black holes about 1.4 billion light-years away (1, 2). White-dwarf collisions do not produce such signals (3). Hence ‘1 and 2 only’ = B.