MRI works on the principle of:
Correct answer: C. Resonance
- A. Beats
- B. Interference
- C. Resonance
- D. Standing waves
Explanation
MRI, or Magnetic Resonance Imaging, operates on the principle of resonance. The strong magnetic field of the MRI machine aligns atomic nuclei in the body, and radio waves are used to disturb this alignment. When the radio waves are turned off, the nuclei return to their original state, emitting signals that are converted into detailed images. This process relies on the resonance of atomic nuclei in the magnetic field.The other options are incorrect: Beats are related to sound wave interference, interference involves wave superposition not central to MRI, and standing waves involve fixed wave patterns which are not part of MRI technology.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
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