interruption of a radio signal is similar to distortion of a radio signal & interruption of a radio signal causes a buzzing sound ->  distortion of a radio signal causes a buzzing sound  distortion of a radio signal causes a buzzing sound & radio signal is a kind of radio wave ->  distortion of the radio waves causes a buzzing sound  distortion of the radio waves causes a buzzing sound & electromagnetic radiation distorts the frequency of the radio waves ->  electromagnetic radiation causes a buzzing sound by distorting the frequency of the radio waves  electromagnetic radiation causes a buzzing sound by distorting the frequency of the radio waves & electromagnetic radiation is made of electromagnetic waves -> electromagnetic waves cause a buzzing sound by distorting the frequency of the radio waves