Food is cooked in a microwave oven by the effect of:
Correct answer: D. Electric resonance
- A. Interference
- B. Mechanical resonance
- C. Magnetic resonance
- D. Electric resonance
Explanation
Microwaves interact with polar molecules (water) causing dielectric heating via dipole rotation and absorption at microwave frequencies-often referred to as electric resonance heating. Thus option D is correct.
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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