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
Define the following terms:
Electromagnetic Wave:
Illuminous of light:
Huygens’ principle:

Write the wave speed equation?
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1. How fast does a radio wave travel that has a frequency of 7.6270 × 108 Hz and a
wavelength of 39.296 cm? Does this radio wave travel through Earth’s atmosphere
or in space? Light travels in a vacuum at 2.997 924 58 × 108 m/s and in air at
2.99709 × 108 m/s.
2. How fast does microwave radiation that has a frequency of 1.173 06 × 1011 Hz and
a wavelength of 2.555 6 mm travel? Does this microwave travel through Earth’s
atmosphere or in space? Light travels in a vacuum at 2.997 924 58 × 108 m/s and
in air at 2.997 09 × 108 m/s.