The variation of the speed of light in a transparent medium with frequency results in
a. interference.
b. diffraction.
c. dispersion.
d. diffuse reflection.
e. polarization.
c
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If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km b. 350,000 km c. 194 km d. 700,000 km e. 4656 km
Thermal Expansion: The coefficient of linear expansion of copper is 17 × 10-6 K-1. A block of copper 30 cm wide, 45 cm long, and 10 cm thick is heated from 0°C to 100°C What is the change in the volume of the block?
A. 2.3 × 10-5 m3 B. 4.6 × 10-5 m3 C. 5.2 × 10-5 m3 D. 6.9 × 10-5 m3 E. 14 × 10-5 m3
Why is the absorption spectrum of atomic hydrogen different from that of helium?
A. There is usually more hydrogen than helium in stars. B. Hydrogen atoms have a lower mass, and are therefore faster. C. The energy differences between orbitals in hydrogen are different from those in helium. D. Helium has more neutrons than hydrogen.
Why do hot water heaters lose their efficiency quicker in households with hard water?
A) The hard water calcium and magnesium ions corrode the heating element. B) The hard water calcium carbonate deposits oxidize the inner tank wall. C) The calcium carbonate on the inner surface of the hot water tank builds up to the point that it insulates the water from the heating element. D) The hard water calcium ions exchange with iron ions from the inner metal wall which react with the water heater base to form rust and deteriorate the bottom of the tank.