4. A popular radio station broadcasts with a frequency of 94.7 megahertz (MHz). What is the wavelength of the broadcast? (1 MHz = 1,000,000 Hz)
5. Cable television operates at a wavelength of about 1300 nanometers. Which wavelengths is this between in the Electromagnetic Spectrum?
6. Which is more dangerous, a radio wave or ultraviolet light?
7. The moon is 234,000 miles from earth. Light travels at 3 x 108 meters per second, and there are 1.62 kilometers in a mile. When you shine a flashlight on the moon, how long does it take for the light to hit the moon?
8. The smallest particle of light is the photon. Max Planck discovered that the energy of light can be calculated, where it is simply equal to a constant number multiplied by the frequency of the light: E = hf Where E is the energy of the light in joules h = Planck’s Constant = 6.626 x 10-34 joules .seconds f = the frequency of light in Hz (which is 1/seconds)
What is the energy of a photon of green light? (See question number 1)
9. What is the energy of a photon of light with a wavelength of 2 meters?
10. Since s = wf, and E = hf, can we calculate energy using wavelength, by combining the two formulas? Please show the combined formula. (Hint: note that f appears in both formulas).
17