• The speed of light is e = 3.00 x 10° m/s. • The speed of sound in air at 20 °C is 343 m/s. Use these values to answer the following questions. (a) Visible light has wavelengths between 380-740 nm. What is the corresponding range of frequencies? (b) You tune into an FM radio station broadcasting at 88.7 MHz. What is the wavelength of these radio waves? (c) The human ear can pick up sounds with frequencies in the range of 20 Hz–20 kHz. What is the corresponding range of wavelengths?
• The speed of light is e = 3.00 x 10° m/s. • The speed of sound in air at 20 °C is 343 m/s. Use these values to answer the following questions. (a) Visible light has wavelengths between 380-740 nm. What is the corresponding range of frequencies? (b) You tune into an FM radio station broadcasting at 88.7 MHz. What is the wavelength of these radio waves? (c) The human ear can pick up sounds with frequencies in the range of 20 Hz–20 kHz. What is the corresponding range of wavelengths?
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Transcribed Image Text:2 Light and Sound
• The speed of light is c = 3.00 x 10° m/s.
• The speed of sound in air at 20°C is 343 m/s.
Use these values to answer the following questions.
(a) Visible light has wavelengths between 380-740 nm. What is the corresponding range of frequencies?
(b) You tune into an FM radio station broadcasting at 88.7 MHz. What is the wavelength of these radio waves?
(c) The human ear can pick up sounds with frequencies in the range of 20 Hz-20 kHz.
What is the corresponding range of wavelengths?
(d) Ultrasound images uses sound waves with frequencies on the order of 5 MHz. The resolution of an image is deter-
mined by the wavelength used. What frequency of light could achieve the same resolution as an ultrasound image?
What range of the electromagnetic spectrum is this?
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