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G3A03
Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?
Pick an answer to check it.
Answer: C. 8 minutes
Ultraviolet and X-rays travel at the speed of light, and light from the Sun takes about 8 minutes to reach Earth. So a flare's radiation affects propagation about 8 minutes after it happens.
Tip: Light from the Sun: 8 minutes.