By what factor would the total power from a black body be modified if the surface area were to decrease by a factor of two while the temperature was doubled? /span>
1.1/16
2.1/8
3.1/4
4.1
5.4
6.8
7.None of the above
8.Cannot be determined
6
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A cold, irregularly shaped region in the interstellar medium that diminishes or completelyobscures the light from background stars is called a//an:
a) irregular galaxy b) dark dust cloud c) emission nebula d) reflection nebula e) planetary nebula
The more baryons there are in the universe (a higher density of baryonic matter), the lower the ratio of deuterium to hydrogen is. Therefore, if Harry measures a higher ratio of deuterium to hydrogen than Sally, Harry infers
A) a higher density of baryons than Sally. B) the same density of baryons as Sally. C) a lower density of baryons than Sally.
A coil is wrapped with 300 turns of wire on the perimeter of a square frame (side length = 20 cm). Each turn has the same area as the frame, and the total resistance of the coil is 1.5 ?. A uniform magnetic field perpendicular to the plane of the coil changes in magnitude at a constant rate from 0.50 T to 0.90 T in 2.0 s. What is the magnitude of the induced emf in the coil while the field is
changing? a. 2.4 V b. 1.6 V c. 3.2 V d. 4.0 V e. 8.4 V
In an X-ray diffraction experiment using X-rays of l = 0.500 × 10^-10 m, a first-order maximum occurred at 5.00°. Find the crystal plane spacing
a. 2.87 × 10^-10 m b. 1.36 × 10^-10 m c. 6.24 × 10^-9 m d. 1.93 × 10^-9 m e. 5.74 × 10^-9 m