Answer: Relativistic electrons travel in circular paths in magnetic fields.
- A Relativistic electrons travel in circular paths in magnetic fields
- B Electrons undergo direct head-on collisions with protons in routine practice
- C A heavy nucleus undergoes spontaneous nuclear fission overall
- D Ordinary thermal blackbody emission from a hot plasma in most cases
Correct answer: A. Relativistic electrons travel in circular paths in magnetic fields
Explanation: Accelerating charges emit EM radiation. Relativistic electrons in synchrotrons are centripetally accelerated, emitting intense, highly collimated EM radiation from radio waves to X-rays.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.