Which one of the following waves require a material medium for their propagation:
Correct answer: D. Sound waves
- A. X-rays
- B. Light waves
- C. y -rays
- D. Sound waves
Explanation
Electromagnetic Waves do not need a medium for their propagation; they can travel in a vacuum. For Example: Light Waves, Radio waves, Gamma rays, etc.Mechanical Waves like Sound Waves do need a medium for their propagation. For example: Earthquakes and water waves.
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About Dawn of Modern Physics
Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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