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Difficulty: HardPhysics Fundamentals and Everyday Applications

Match the everyday physical phenomena and devices in List-I with their underlying physics principles in List-II, and select the correct matching pairs:

  • Transmission of light signals through flexible optical fibers in telecommunicationsTotal internal reflection occurring repeatedly at a high-to-low refractive index boundary
  • Cooling of stored water inside a porous earthenware pitcher during hot weatherLatent heat absorption driven by surface evaporation through micro-porous channels
  • Production of vibrant iridescent color patterns on thin oil films floating on waterConstructive and destructive optical wave interference across thin dielectric layers
  • Detection of underwater obstacles and seafloor depth mapping using SONAR systemsAcoustic wave pulse reflection and echo time-of-flight measurement

Answer

The correct pairings link: optical fiber transmission with total internal reflection; earthenware pitcher cooling with latent heat absorption during surface evaporation; thin oil film colors with thin-film optical wave interference; and SONAR underwater mapping with acoustic wave reflection.
Each phenomenon is matched strictly to its core physics principle: total internal reflection keeps light confined inside telecommunication fibers; evaporative cooling extracts latent heat to lower water temperature in porous vessels; thin-film wave interference produces iridescence on oil slicks; and acoustic wave reflection enables distance calculations in SONAR navigation.

Step-by-Step Solution

1
Analyze the principle behind optical fiber data transmission.
Optical fibers require light signals to stay contained inside the glass core without escaping, which is achieved by total internal reflection at the core-cladding interface.
Light striking the boundary at an angle greater than the critical angle undergoes complete reflection back into the denser core.
2
Examine the thermodynamics of water cooling in an earthenware pitcher.
Water seeps through pores to the exterior where it undergoes phase change into vapor, absorbing latent heat of vaporization from the body of water.
Evaporation is a cooling process because escaping high-energy molecules reduce the mean kinetic energy of the remaining liquid.
3
Investigate the optical mechanism responsible for colorful oil slicks.
Light reflected from the upper surface of the oil film combines with light reflected from the lower oil-water interface, undergoing thin-film interference.
Depending on film thickness and wavelength, specific colors experience constructive interference while others undergo destructive interference.
4
Identify the acoustic mechanism utilized in SONAR systems.
SONAR devices emit ultrasonic pulses and detect reflected echoes returning from submerged surfaces.
Knowing the speed of sound in seawater and measuring echo return time yields precise distance measurements via wave reflection principles.

Key Concept

Everyday Applications of Wave Optics, Acoustic Reflection, and Thermal Phase Transitions
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Topics

Physics Fundamentals and Everyday Applications

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