The cosmic background radiation appears compatible with a blackbody source at what temperature?
a. 0.000 3 K
b. 0.03 K
c. 3 K
d. 300 K
c
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When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced?
A) 0.4 B) 1/4 C) 2 D) 4 E) None of the other choices is correct.
A carousel that is 5.00 m in radius has a pair of 600-Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.800 rad/s. A stationary listener is located at a distance from the carousel
The speed of sound is 350 m/s. The longest wavelength reaching the listener from the sirens is closest to A) 57.0 cm. B) 57.7 cm. C) 58.3 cm. D) 59.0 cm. E) 59.6 cm.
An air-filled capacitor stores a potential energy of 6.00 mJ due to its charge. It is accidentally filled with water in such a way as not to discharge its plates
How much energy does it continue to store after it is filled? (The dielectric constant for water is 78 and for air it is 1.0006.) A) 0.077 mJ B) 468 mJ C) 0.040 mJ D) 6.00 mJ
The intensity of a 80-dB whistle is quadrupled. What is the new decibel level?
a. 80 dB b. 68 dB c. 89 dB d. 320 dB