As the ac frequency in an RLC circuit is increased to very high values, which of the contributions to the impedance dominates?
A. the capacitive reactance
B. the inductive reactance
C. the resistance
D. the combined capacitive reactance and the resistance
E. More information is needed.
B. the inductive reactance
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Which of the following cannot be determined from the spectrum of a star?
a. chemical composition b. surface temperature c. radial (along line of sight) velocity d. tangential (perpendicular to line of sight) velocity e. radial (along line of sight) velocity
Which of the following best describes the situation according to Jackie?
A) She stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. Since Vega is 25 light-years away, she says it takes Vega about 25 years to reach her. B) She stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. She sees the distance from Earth to Vega shortened considerably from 25 light-years, and therefore it takes far less than 25 years for Vega to reach her. C) She says that the 25-light-year trip takes only a few months and therefore concludes that she is traveling faster than the speed of light. D) She's taking a trip that takes 25 years from Earth to Vega.
A sievert (Sv) is
A) the SI unit of absorbed dose = 1 J/kg = 100 rad. B) 10-2 J/kg. C) 3.70 × 1010 decays/s in radium. D) a dosage of 2.58 × 10-4 C/kg. E) the effective dose of 1 Gy.
A light ray reflects from a surface. If the angle of incidence is 
what is the angle between the reflected ray and the incident ray at the surface?
a. 
b. 
c. 
d. 
e. 