| Sound waves | Radio waves |
| They are mechanical waves which require a material medium for their propagation | They are electromagnetic waves which do not require any medium for their propagation |
| They are longitudinal in nature in which the particles vibrate in a direction parallel to the direction of propagation | They are transverse in nature in which the particles vibrate in a direction perpendicular to the direction of propagation |
| They cannot be polarised | They can be polarised |
| They are very slow as compared to radio waves | They are very fast as compared to sound waves |
| Since wavelength=speedfrequency, even if their frequency is same as radio waves, their wavelength will be very small as compared to radio waves | Since
wavelength=speedfrequency, even if their frequency is same as
sound waves, their wavelength will be very big as compared to sound waves |