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The speed varies according to the refractive index of the objects.
Sound is a longitudinal wavelength that has wavelength, velocity, frequency and amplitude. It travels through solid objects by going through vibration.
Sound travels through particles which vibrate in solids liquids or gases, which is why sound can't travel through vacuums like space.
The more closely packed molecules are in a medium, the faster sound travels through the medium, so sound travels slowest through a gas under low pressure.
Sound travels faster through air. Though sound travels farther through solid objects (vibrations), it is faster when traveling through air waves.
Sound travels through water. Sound reflects from objects with different densities. You can listen for the echoes.
It tells us that light only travels in straight lines and cant travel through most objects.
Sound travels faster through dense objects.
radiation
That depends, conduction does but radiation travels in waves so just goes through anything
Sound can travel through most substances but the loudness depends on the substance.
Sounds travel better through denser objects and since water is denser than wood, sound travels through it better.