A series LC circuit in a radio is in resonance with AM 1200 kHz. If the radio station is changed to AM 600 kHz, by what factor must the capacitance be multiplied to again achieve resonance?
a. 4
c. 1/2
b. 2
d. 1/4
A
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Converging mirrors
A. Will reflect parallel light rays to the focal point of the mirror. B. Will cause parallel light rays to spread out. C. Will reflect parallel light rays back along their original path D. Will scatter parallel light rays in random directions.
During which step in cosmic evolution were the chemical bases for life created?
A) particulate evolution B) stellar evolution C) chemical evolution D) biological evolution E) cultural evolution
A very massive body A and a less massive body B move toward each other under the influence of gravity. Compared to the force on A, the force on B is
1) greater. 2) the same. 3) less. As A and B get closer and closer, each experiences an increase in 4) velocity. 5) acceleration. 6) force. 7) all of these. 8) none of these.
What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 417 nm B) 257 nm C) 344 nm D) 565 nm E) 610 nm