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
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
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.
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