Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed inductor, variable resistor
b. fixed resistor, variable inductor
c. fixed inductor, variable capacitor
d. fixed capacitor, variable resistor
c
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Some narrow rings of Saturn are seen in space probe photos to be caused by
a. gravitational interactions between ring particles. b. a spiral density wave which confines them. c. the magnetic field which holds them in place. d. small shepherd moons that orbit inside and outside the rings
Why do we think Mercury contracted after it formed?
What will be an ideal response?
At what distance could one theoretically distinguish two automobile headlights separated by 1.5 meters? Assume a pupil diameter of 0.50 cm and yellow headlights seen at the wavelength 5.0 × 10^?7 m. Assume eye fluid has an average n = 1.33
a. 6.0 km b. 12 km c. 9.0 km d. 3.0 km e. 16 km
A binary star system in the constellation Orion has an angular separation between the two stars of 1.2 × 10^-5 radians. If l = 5 × 10^-7 m, what is the smallest aperture (diameter) telescope that may be used to resolve the two stars?
a. 10 cm b. 5 cm c. 50 cm d. 1 m e. 4 cm