Isolated bells ring clearly, while bells crammed in a box have a muffled ring. This is analogous to light emitted by
A) a laser.
B) a fluorescent lamp.
C) an incandescent lamp.
D) a phosphorescent source.
E) none of the above
Answer: C
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Shown that (a) Eb?/T 5 = f(?T) only. For ?T = 5000 ?m K, calculate Eb?/T 5.
GIVEN • ?T = 5000 ?m K = 0.005 m K FIND Shown that (a) Eb? /T 6 = f(?T) (b) Calculate E b? /T 5 for the ?T given
A 320-g air track cart traveling at 1.25 m/s collides elastically with a stationary 270-g cart. What is the speed of the 320-g cart after the collision?
A) 0.678 m/s B) 0.106 m/s C) 0.212 m/s D) 1.36 m/s E) 1.14 m/s
The entropy of an isolated system must be conserved, so it never changes
A) True B) False
Earth's original atmosphere was
A) very similar to the atmosphere we have today. B) rich in both O2 and O3. C) obliterated after the birth of the Sun. D) a mixture of N2, CO2, and O3.