Speed of all EM Radio waves Due Date: wed 3 x 108 m/sec Name arab Note Follow yo

Question

Speed of all EM Radio waves Due Date: wed 3 x 108 m/sec Name arab Note Follow your Scientific Notation & Prope rUnitslr wavelength is 4.0m. How oadcasts a radio wave whose 3. When Neil A. Armstrong landed on the moon for least should know) his first line. Find the time that it took for Neil A. Armstrong's signal of "Go for it, Mrs. Rothstein!" to travel from the moon to the Earth, a distance of 384 x 10 km. uency of the wave m. How much is the the 1* time, he sald 2 things. We all know (or at C31044. He 3.02 4. Find the communication time for the first person who will someday walk on Mars, which is about most likely be? 0 km from the Earth. 5. A truck driver is broadcasting at a frequency of ROR MHz with a CB radio. Determine the wavelength of the EM wave being used. 7. It said that the observation of a supernova, the explosive "death of a star" is like looking back in time. Why? 6. What might the abbreviation CB stand for? Why is the word abbreviation so long? 8. A WiFi router emits a signal of GHz. How much is the wavelength of the signals emitted by the router? Round to the 4 decimal places. 9. The occupants of a home that use the WiFi would really like to remain alive. Why should the cells in their bodies be smaller than the wavelength of the WiFi signal?

Explanation / Answer

1.

f = frequency = speed/wavelength

f = (3 x 108)/(3.02) = 9.93 x 107 Hz

2.

very high frequency

3.

d = distance = 384 x 103 km = 384 x 103 x 103 m = 3.84 x 108 m

v = speed = 3 x 108 m/s

time is given as

t = d/v = (3.84 x 108)/(3 x 108) = 1.3 sec

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