The circuit below contains three 100-W light bulbs and a capacitor. The emf is 110 V and the capacitor is fully charged. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
A and B
e.
A and C
b
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Intensity of Sound: If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?
A. 67 dB B. 13 dB C. 44 dB D. 88 dB
An advantage of synthetic detergents over soaps is that they
a. do not contain sulfur. b. dissolve grease. c. do not form scum in hard water. d. are more readily biodegradable.
Why do scientists think tiny quantum ripples should have been present in the very early universe?
A) The shock wave of the Big Bang caused ripples that expanded outward with time. B) The energy released when the strong force froze out of the GUT force caused shock waves that produced ripples in the universe. C) Matter and antimatter particles that spontaneously formed from high-energy photons caused disruptions in the radiation field. D) The annihilation of matter and antimatter particles caused tiny explosions that disrupted the radiation field. E) Quantum mechanics tells us that the energy fields at any point in space be continually fluctuating as a result of the uncertainty principle.
Two instruments produce a beat frequency of 5 Hz. If one has a frequency of 264 Hz, what could be the frequency of the other instrument?
a. 269 Hz b. 254 Hz c. 264 Hz d. 5 Hz e. 274 Hz