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Answer:
1. 6.63 × 10^40 J
the number 40 is an exponent, i just don't know how to put it up there
2. The wavelength of green light from a traffic signal is about 520nm.
3. Radio waves have the longest wavelengths in the EM spectrum, according to NASA, ranging from about 0.04 inches (1 millimeter) to more than 62 miles (100 kilometers). They also have the lowest frequencies, from about 3,000 cycles per second, or 3 kilohertz, up to about 300 billion hertz, or 300 gigahertz
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Explanation:
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