Describe the full electromagnetic spectrum from radio waves to gamma rays, in order of increasing frequency and energy; explain that all EM waves travel at the same speed in a vacuum; and describe the uses and hazards of different regions
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Question 1 of 3
A satellite orbiting Earth sends two signals at the same moment: a low‑frequency radio broadcast and a high‑frequency X‑ray pulse. The distance from the satellite to a receiving station on the ground is 300,000 km. If the radio broadcast is received 1.00 s after it is sent, when will the X‑ray pulse be received?
Question 2 of 3
Which of the following lists the seven regions of the electromagnetic spectrum in order from the lowest frequency to the highest frequency?
Question 3 of 3
A scientist is comparing two kinds of electromagnetic radiation used in everyday life: the infrared light from a TV remote (wavelength ≈ 8 µm) and the ultraviolet light from a germ‑killing lamp (wavelength ≈ 250 nm). Both devices are set to emit the same total power (intensity). Which statement best explains why the ultraviolet light is more hazardous to living cells?
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