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    Question: Who first used radio waves to transmit the human voice?
    Answer: The first known broadcast transmissions of music and voice were made by Reginald A. Fessenden using an experimental transmitter in December 1906.
    Question: Who invented the radio?
    Answer: In the 1890s, Guglielmo Marconi invented the radio. Like the telegraph, his invention at first sent messages in code, not sound.
    Question: Which of these was the first portable music device?
    Answer: The Sony Walkman, released in 1979, was a portable cassette player that allowed people to take music wherever they went.
    Question: In what year was the iPod first sold?
    Answer: Apple’s iPod portable music device was first released in 2001. The initial version had a 5GB hard drive.
    Question: Which of these is not a format for music storage?
    Answer: The JPEG file format is used for photographs. The other formats are used to store music digitally.
    Question: Which of these terms describes a very short radio wave?
    Answer: A microwave is a radio wave with a very short wavelength.
    radio. Early radio technology. An antique crystal set using a cat's whisker from the early 1920s. A crystal radio receiver or cat's whisker receiver a radio receiver. Runs on the power received from radio waves (diode).

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