The energy differences in some of the rotational energy levels of the water molecule allow
a. X-rays to be produced.
b. cooking with microwaves.
c. visible spectral lines to be formed.
d. lasers to operate.
b
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The brightest main-sequence star in a cluster has a surface temperature of 30,000 K and a luminosity of about 104 LSun. Referring to the figure above as needed, what is the approximate age of the cluster?
A) 107 years B) 109 years C) 1011 years D) 1013 years
A 6.0-?F air-filled capacitor is connected across a 100-V potential source (a battery). After the battery fully charges the capacitor, it is left connected and the capacitor is immersed in transformer oil, which has a dielectric constant of 4.5
How much additional charge flows from the battery onto the capacitor during this process? A) 1.2 mC B) 2.1 mC C) 2.5 mC D) 1.7 mC
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless, horizontal surface. A second string, attached only to the 6.0-kg block, has horizontal force = 45 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks
a. 18 N c. 12 N b. 27 N d. 9.0 N
When the frequency of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons
a. increases b. decreases c. stays the same d. becomes more quantized e. becomes less quantized