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Difficulty: MediumWaves, Sound, and Light

Wave interactions and behaviors produce distinct physical effects in sound and light. Match each wave phenomenon to its corresponding real-world observation.

  • Doppler effectAn emergency vehicle's siren sounds higher in pitch as it approaches and lower as it moves away.
  • ResonanceA crystal glass vibrates vigorously and shatters when exposed to a specific sound matching its natural vibration rate.
  • Total internal reflectionLight pulses travel long distances through a fiber-optic cable by reflecting entirely within the core.
  • DiffractionAM radio signals curve around large hills and buildings to reach receivers located in obstructed areas.

Answer

Doppler effect matches the shift in pitch of a moving siren; Resonance matches the shattering of a glass at its natural frequency; Total internal reflection matches light confinement in fiber optics; Diffraction matches radio waves bending around hills and structures.
Each wave phenomenon maps directly to its underlying principle: relative motion alters perceived pitch via the Doppler effect; matching natural frequencies drives maximum vibrational amplitude via resonance; optical containment in fiber cores relies on total internal reflection; wave propagation around physical obstacles occurs through diffraction.

Step-by-Step Solution

1
Analyze the effect of source motion on perceived sound pitch.
Compression and expansion of wavefronts due to motion produces the Doppler effect, matching the approaching and receding siren.
Perceived frequency changes result directly from relative velocity between the source and observer.
2
Identify the behavior where matching frequencies produce maximum vibration amplitude.
Energy transfer at an object's natural frequency defines resonance, matching the shattering crystal glass.
When forcing frequency matches natural frequency, energy accumulates constructively to cause large mechanical stress.
3
Examine the mechanism allowing light transmission without leakage in fiber optics.
Complete reflection at the core-cladding boundary beyond the critical angle is total internal reflection, matching fiber-optic light pulses.
Light cannot refract out when traveling from high to low refractive index at incident angles exceeding the critical threshold.
4
Determine how long-wavelength waves navigate physical terrain barriers.
The bending of waves around large structures without a change in medium is diffraction, matching obstructed radio wave reception.
Waves naturally spread into geometric shadow zones behind obstacles comparable to their wavelength.

Key Concept

Wave behaviors and boundary interactions
Estimated Time:1m 15s
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Topics

Waves, Sound, and Light

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