Question

When one member of a binary star system is a black hole, astronomers may detect flickering X-rays coming from

	a.	the photosphere of the companion star
	b.	inside the black hole event horizon
	c.	the singularity
	d.	a disk of material around the black hole pulled from the companion star

Answer 1

The Right Option for this Question is Option [D] A Disk of material around the Black Hole Pulled from the Companion Star.

These Disks are actually called the Accretion Disks.Material, such as gas, dust and other stellar debris that has come close to a black hole but not quite fallen into it, forms a flattened band of spinning matter around the event horizon called the accretion disk (or disc). Although no-one has ever actually seen a black hole or even its event horizon, this accretion disk can be seen, because the spinning particles are accelerated to tremendous speeds by the huge gravity of the black hole, releasing heat and powerful x-rays and gamma rays out into the universe as they smash into each other.

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