The phase angle of a series RL circuit with a 20.0-mH inductor and a certain resistor at 1000 Hz is 20.0°. What is the value of the resistance in this circuit?
A) 145 ?
B) 100 ?
C) 245 ?
D) 200 ?
E) 345 ?
E
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A large telescope of mass 8410 kg is in a circular orbit around the earth, making one revolution every 927 minutes. What is the magnitude of the gravitational force exerted on the satellite by the earth?
(G = 6.67 × 10-11 N ? m2/kg2, Mearth = 6.0 × 1024 kg)
The Compton experiment demonstrated which of the following when an x-ray photon collides with an electron?
a. Momentum is conserved. b. Energy is conserved. c. Momentum and energy are both conserved. d. Wavelength of scattered photon equals that of incident photon.
When the principal quantum number is n = 5, how many states have distinct pairs of values of ? and m??
1.1 2.5 3.9 4.25
When an atom's electrons fall down to lower energy levels in a thin cloud of hot gas, what is produced?
A) thermal radiation B) an absorption line spectrum C) an emission line spectrum D) an infrared spectrum E) new interstellar compounds