Unless otherwise indicated, assume that the speed of sound in air is 344 m/s. wavelength of an FM radio station signal broadcasting at a frequency 12.2 Periodic Mechanical Waves of 104.5 MHz. (b) X-rays. X-rays have a wavelength of about 0.10 nm. What is their frequency? (c) The Big Bang. Microwaves with a 1. I BIO Audible wavelengths. The range of audible frequencies is wavelength of 1.1 mm, left over from soon after the Big Bang, have from about 20 Hz to 20,000 Hz. What is the range of the wave- been detected. What is their frequency? (d) Sunburn. Sunburn (and lengths of audible sound in air? (b) Visible light. The range of skin cancer) is caused by ultraviolet light waves having a frequency visible light extends from 400 nm to 700 nm. What is the range of around 1010 Hz. What is their wavelength? (e) SETI. It has been of visible frequencies of light? (c) Brain surgery. Surgeons can suggested that extraterrestrial civilizations (if they exist) might try remove brain tumors by using a cavitron ultrasonic surgical aspira- to communicate by using electromagnetic waves having the same tor, which produces sound waves of frequency 23 kHz. What is the frequency as that given off by the spin flip of the electron in hy- wavelength of these waves in air? (d) Sound in the body. What drogen, which is 1.43 GHz. To what wavelength should we tune would be the wavelength of the sound in part (c) in bodily flu- our telescopes in order to search for such signals? (f) Microwave ids in which the speed of sound is 1480 m/s, but the frequency is ovens. Microwave ovens cook food with electromagnetic waves of unchanged? frequency around 2.45 GHz. What wavelength do these waves have? 2. | The electromagnetic spectrum. Electromagnetic waves, which 3. I If an earthquake wave having a wavelength of 13 km causes the include light, consist of vibrations of electric and magnetic fields, ground to vibrate 10.0 times each minute, what is the speed of the and they all travel at the speed of light. (a) FM radio. Find the wave