A three-dimensional image made using a laser is a(n)
a. emission spectrum.
b. absorption spectrum.
c. wave function.
d. hologram.
e. photoelectric effect.
d
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If the plane of the Earth's equator were not tilted with respect to the ecliptic plane
a. the daylight period of Earth would be the same year-round. b. there would be no seasonal changes. c. Earth's poles would not experience six month long nights. d. All of the above
Derive an equation in the form ch = f(T, D, U?) for flow of air over a long horizontal cylinder for the temperature range 0°C to 100°C, using as a basis.
GIVEN
• Flow over a long horizontal cylinder
• Air temperature range is 0°C < T < 100°C
FIND
• An equation in the form ch = f(T, D, U?) based on Equation (6.3)
ASSUMPTIONS
• Steady state
• Prandtl number variation is negligible
SKETCH
Briefly state the uncertainty principle
What will be an ideal response?
What energy must be added or given off in a reaction where a helium atom is separated into two hydrogen atoms and two neutrons? (Atomic masses for each: hydrogen, 1.007825 u; neutron, 1.008665 u; helium, 4.002602 u; also, 1 u = 931.5 MeV/c2.)
a. 28.3 MeV given off c. 20.7 MeV given off b. 20.7 MeV added d. 28.3 MeV added