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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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.
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.
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
Are sand dunes stationary or do they move and migrate?
What will be an ideal response?