What spectral class of star fits between a type G and a type M?
a. L
b. K
c. A
d. F
[Ques. 2] Which of these instruments is based on the theory of matter waves?
a. Microwave oven
b. X-ray tube
c. Electron microscope
d. Cathode ray tube
[Ques. 3] An ac power generator produces 50 A (rms) at 3600 V. The voltage is stepped up to 100000 V by an ideal transformer and the energy is transmitted through a long distance power line which has a resistance of 100 ohms. What percentage of the power delivered by the generator is dissipated as heat in the long-distance power line?
[Ques. 4] White dwarfs are relatively
a. hot and dim.
b. cool and dim.
c. hot and bright.
d. cool and bright.
[Ques. 5] The de Broglie wavelength of a particle is inversely proportional to both its speed and its
a. spin.
b. electric charge.
c. volume.
d. mass.
[Ques. 6] A 10.0- resistor, 10.0-mH inductor, and 10.0-F capacitor are connected in series with a 10.0-kHz voltage source. The rms current through the circuit is 0.200 A. Find the rms voltage drop across each of the 3 elements.
[Ques. 7] What color are the stars with the hottest photosphere?
a. White
b. Yellow
c. Red
d. Blue
[Ques. 8] Calculate the de Broglie wavelength for an electron (m = 1 10-30 kg) moving at 3.1 106 m/s.
a. 1.8 1010m
b. 2.4 1010m
c. 1.9 1010m
d. 2.1 1010m
[Ques. 9] Suppose the circuit parameters in a series RLC circuit are: L = 1.00 H, C = 10.0 nF, R = 100 , and the source voltage is 220 V. Determine the resonant frequency of the circuit and the amplitude of the current at resonance.
[Ques. 10] The name of which astronomer is most closely linked with that of Henry Russell?
a. Henrietta Leavitt
b. Johannes Kepler
c. Ejnar Hertzsprung
d. Edwin Hubble
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