What is the difference between radiation and sound?

A. Radiation has wavelength and frequency, whereas sound does not.

B. Sound needs a physical medium through which to travel, whereas radiation does not.

C. Radiation travels much slower than sound.

D. Radiation travels at different speed, depending on wavelength, whereas sound always travels at the same speed.What is the difference between radiation and sound?
B. Sound needs a physical medium through which to travel, whereas radiation does not.



This is why we can see our sun, but not hear it.



Edit: Micheal T, it isn't a mystery at all, it is in fact well understood.What is the difference between radiation and sound?
Yep, B.



Electromagnetic waves (such as radiation) somehow manage to travel through "empty space", or "vacuum", which is a great mystery in physics.



Sound, however needs matter to travel via.

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