The Intense X-Rays Emitted by a Suspected Black Hole Are

question 368

Multiple Choice

The intense X-rays emitted by a suspected black hole are generated by what physical mechanism?

• A) the blueshifting of light emitted by hot gas into the X-ray region of the electromagnetic spectrum by the extreme speed of the gas moving into the black hole
• B) induced emission in atoms by the intense gravitational field as material moves toward the black hole
• C) compressional heating as material moves into the hole
• D) the deceleration of matter as it abruptly stops at the event horizon of the black hole

---

Definitions:

Nuclear Medicine

A medical specialty involving the application of radioactive substances in the diagnosis and treatment of diseases.

Radiopaque Substance

A substance that does not allow X-rays to pass through and appears white or light on an X-ray film, used in medical imaging to highlight structures.

Radioactive Isotope

An isotope that exhibits radioactive decay, emitting radiation in the process.

Fluorescence

The emission of light by a substance that has absorbed light or other electromagnetic radiation, usually seen as a different color.