A certain radio wave has a wavelength of 6.0 × 10^-2m. What is its frequency in hertz?
5.0 × 10^5 Hz
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Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
A. bulb 1 glows more brightly. B. bulb 2 glows more brightly. C. both bulbs glow equally brightly. D. bulb 1 goes out. E. bulb 2 goes out.
According to the theory of seafloor spreading, molten rock is rising up along
A) the mid-ocean ridges. B) trenches that border continental margins. C) islands surrounding the Pacific volcanic rim. D) areas of sinking seafloor.
When a light ray travels between any two points, the path it takes is the one that (Hint: Eliminate answers you know are wrong.)
a. covers the greatest distance. b. follows the greatest index of refraction. c. avoids travel in more than one medium. d. is the mean between the longest and the shortest paths. e. takes the least time.
As a high-altitude balloon sinks lower and lower into the atmosphere it undergoes a decrease in
A) volume. B) density. C) weight. D) mass. E) none of the above