At absolute temperature T, a black body radiates its peak intensity at wavelength ?. At absolute temperature 2T, what would be the wavelength of the peak intensity?
A) ?/2 B) 2? C) ? D) 16? E) ?/16
A
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How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?
a. 3.3 × 10^?6 J b. 3.3 J c. 0.003 J d. 10?4 J e. 3.0 × 10^5 J
The age of the Universe can be deduced from
A. Kepler's Third law. B. Hubble's law. C. Shapley's law. D. the Doppler shift law. E. the Inverse-square law.
Are sand dunes stationary or do they move and migrate?
What will be an ideal response?
An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?
A) It is reduced by a factor of two. B) It is reduced by a factor of four. C) It increases by a factor of two. D) It increases by a factor of four. E) It doesn't change.