Assertion A A black hole is an astronomical entity that cannot be seen by telescope Reason R The gra...........

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Assertion (A): A black hole is an astronomical entity that cannot be seen by telescope.

Reason (R): The gravitational field on a black hole is so strong that does not allow even light to escape.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

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Explanation:

A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, no locally detectable features appear to be observed.

By: ANIVESH KUMAR

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Sushank Saini

NASA took the first image of black hole through Event Horizon Telescope,so A is a false statement.Moreover,both these statements seem to be mutually exclusive of each other and hence B statement in no way can be a an explanation for A.Kindly rectify.

abhimanu admin

Kindly Read the statement carefully it says black holes can't be seen and is correct bcoz only the event horizon can be seen i.e, the boundary the boundary only hence statement A is correct.

Sushank Saini

Siddharth Jena