With reference to the fast radio burst FRB consider the following statements FRBs are bright flashes...........

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With reference to the fast radio burst (FRB), consider the following statements

FRBs are bright flashes of light that appear for a few milliseconds and then vanish.
Since the first FRB was discovered in 2007, 140 more were discovered until June 2021.

Select the correct statement.

1 only

2 only

Both

None

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Explanation:

In a paper published in Nature, astronomers have reported a fast radio burst (FRB) whose characteristics are different from almost all other FRBs previously detected, except one.

The scientists used the National Science Foundation’s Karl G Jansky Very Large Array (VLA) and other telescopes to study the object.
FRBs are bright flashes of light that appear for a few milliseconds and then vanish.
Since the first FRB was discovered in 2007, 140 more were discovered until June 2021, according to a post on the MIT website.
Their origins are unknown, and their appearance is unpredictable.
The new study in Nature describes FRB 20190520B, first discovered in 2019. What makes it different is that unlike many other FRBs, it emits frequent, repeating bursts of radio waves. And between bursts, it constantly emits weaker radio waves.
Only one FRB has been previously observed to behave this way. Called FRB 121102, that was discovered in 2012.

Hence both statements are correct.