Which one of the following require a material medium for their propagation?
Correct answer: A. Sound waves
- A. Sound waves
- B. Light waves
- C. Heat waves
- D. X-rays
Explanation
Sound waves require a material medium for their propagation. Sound is a mechanical wave that involves the transfer of energy through compressions and rarefactions of a material medium, such as air, water, or solids.
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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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