Based on current estimates of the value of Hubble's constant, approximately how old is the universe?
A) 10 billion years old
B) 12 billion years old
C) 14 billion years old
D) 18 billion years old
E) 20 billion years old
C) 14 billion years old
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The H-R diagram is a plot of stars' ________.
A. luminosity vs. temperature B. mass vs. diameter C. temperature vs. mass D. mass vs. luminosity
In a double-slit experiment, the intensity of light at the center of the central fringe is measured to be 6.2 × 10-6 W/ m2. What is the intensity halfway between the center of the fringe and the first dark band?
A) 6.2 × 10-6 W/ m2 B) 3.1 × 10-6 W/ m2 C) 4.7 × 10-6 W/ m2 D) 1.6 × 10-6 W/ m2 E) 0.12 × 10-6 W/ m2
A 5000-? resistor and a 50-?F capacitor are connected in series at t = 0 with a 6-V battery. The capacitor is initially uncharged. What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?
What will be an ideal response?
The ____ of an object can be measured in degrees
a. apparent brightness b. apparent magnitude c. zenith d. angular diameter e. color