Which of the following correctly orders electromagnetic waves by increasing frequency? a. radio, visible, infrared, x-ray b. infrared, ultraviolet, visible, gamma c. visible, infrared, ultraviolet, x-ray d. infrared, visible, x-ray, gamma

A local radio station broadcasts radio waves at 99.7 MHz. Unlike sound, radio waves can pass into outer space, because they are disturbances not in air molecules but in the e-m fields that exist even in the vacuum of space. It's energy traveling independent of matter. a. When that radio wave hits you, how many pulses (wave crests) of em radiation hit you per minute (60 seconds)? (reminder: M = 10 6) b. Radio waves move at the speed of light (c), how far apart is each wave crest (wavelength)? c. If we boosted the signal strength so that station could be heard on the moon, would either the wavelength or frequency change?

Problem 5. Assume that electromagnetic propagation through space is what we have been calling "free space." b) How long does it take to communicate with electromagnetic waves from Mars to Earth? Another way of asking this question is how long does it take for an electromagnetic signal originating on Mars to reach Earth? c) for two humans separated by 6 feet, how long does it take for the light reflected off of one person to be seen by the other person?

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