When scattering 3.28 Angstrom X-rays from a crystal an interference maximum occurs at a scattering angle of 23.0 degrees. What is the crystal spacing?
A. 4.2 Angstroms
B. 16.8 Angstroms
C. 6.3 Angstroms
D. 8.4 Angstroms
A. 4.2 Angstroms
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Fluid Flow: Ideal incompressible water flows through a horizontal pipe of cross-sectional area 10.0 cm2 at a pressure of 0.250 atm with a volume flow rate of 1.00 × 10-3 m3/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.00 cm2. What is the pressure at the valve?
A. 0.112 atm B. 0.157 atm C. 0.200 atm D. 0.235 atm
What conditions are required for a solar eclipse?
A) The phase of the Moon must be new, and the Moon's orbital plane must lie in the ecliptic. B) The phase of the Moon can be new or full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. C) The phase of the Moon must be full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. D) The phase of the Moon must be full, and the Moon's orbital plane must lie in the ecliptic. E) The phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (3.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 3.0 m.
A. 0.79 kN/C B. 0.17 kN/C C. 0.62 kN/C D. 0.34 kN/C E. 0.28 kN/C
Which process would release energy from gold, fission or fusion? From carbon?
A) gold: fission; carbon: fusion B) gold: fusion; carbon: fission C) gold: fission; carbon: fission D) gold: fusion; carbon: fusion