The apparent brightness of an object is calculated as: . If one knew the luminosity and apparent brightness of a star that was too distant for a parallax measurement, what would be the best approach to determining its distance?
A) Insert the values for luminosity and apparent brightness into the equation, then guess the value for the distance that satisfies the equation.
B) Solve the equation for distance, then insert the values for luminosity and apparent brightness into the new equation.
C) The distance cannot be determined.
B) Solve the equation for distance, then insert the values for luminosity and apparent brightness into the new equation.
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The percentage of 235U--as opposed to 238U--present in light-water uranium power reactors is closest to
A) 90 percent. B) 50 percent. C) 5 percent. D) 75 percent. E) 25 percent.
Two resistors can be either connected to a battery in series or in parallel. In which case, if either, is the equivalent resistance the smallest?
a) When the two resistors are wired in parallel, the equivalent resistance is less than if they are wired in series. b) When the two resistors are wired in series, the equivalent resistance is less than if they are wired in parallel. c) Both series and parallel wiring will result in the same equivalent resistance. d) It is not possible to know which method of wiring will result in the lowest equivalent resistance without knowing the values of the two resistances.
A hydrogen atom consists of an electron and a(n)
A) proton. B) ion. C) neutrino. D) neutron. E) lepton.
If you have 7 total 100-W light bulbs in a parallel circuit in your basement and you leave them on for 1.5 days, how much energy (in kilowatt hours) would be used?
a. 25.2 kWh b. 1050 kWh c. 3520 kWh d. 25200kWh