Answer: Noise creates amplitude variations (easily filtered in FM); FM has wider bandwidth for more audio detail.
- A Noise creates amplitude variations (easily filtered in FM); FM has wider bandwidth for more audio detail
- B FM signals generally travel a much farther physical distance through the atmosphere than AM signals
- C FM uses inherently shorter wavelengths that carry noticeably more photon energy per cycle under usual circumstances
- D AM signals are far more strongly affected by the Doppler shift than FM signals are according to most researchers
Correct answer: A. Noise creates amplitude variations (easily filtered in FM); FM has wider bandwidth for more audio detail
Explanation: Most noise/interference affects signal amplitude. In FM, information is in frequency (constant amplitude), so amplitude noise is stripped out, giving cleaner reception.
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.