On a particularly foggy day the visibility is ¼ mile. This means that 95% of the visible light is absorbed after traveling ¼ mile. What is the extinction coefficient for the atmosphere?
What will be an ideal response?
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Does Venus have auroras around its poles, like Earth? Why or why not?
A) no, because it lacks a global magnetic field B) yes, because it is bombarded by charged particles from the Sun C) no, because its atmosphere is too thick D) yes, because strong winds generate light near its poles
A coil is wrapped with 300 turns of wire on the perimeter of a circular frame (radius = 8.0 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is turned on perpendicular to the plane of the coil. This field changes at a constant rate from 20 to 80 mT in a time of 20 ms. What is the magnitude of the induced emf in the coil at the instant the magnetic field has a
magnitude of 50 mT? a. 24 V b. 18 V c. 15 V d. 10 V e. 30 V
Radioactive decay furnishes a good example of
A) nuclear fusion. B) quantum uncertainties. C) the wavelike nature of microscopic particle. D) nuclear fission. E) quantum non-locality.
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is
a. 2.7 Ns, up. b. 2.7 Ns, down. c. 7.3 Ns, up. d. 7.3 Ns, down. e. 9.6 Ns, up.