Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's apparent brightness in our sky?
A) It would decrease by a factor of 2.
B) It would decrease by a factor of 4.
C) It would increase by a factor of 2.
D) It would increase by a factor of 4.
E) It would remain the same.
B) It would decrease by a factor of 4.
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What Einstein discovered about space and time is that they
A) are separate entities. B) are parts of one whole. C) follow an inverse-square law. D) are special to space travelers.
A helium-neon laser emits red light having a wavelength of 6.4 × 10^-7 m and a power of 0.5 mW. How many photons are emitted each second?
a. 6.4 × 10^38 b. 1.6 × 10^21 c. 3.2 × 10^25 d. 2.6 × 10^18 e. 1.6 × 10^15
Venus is visible to us:
a) only during its new phase. b) only near sunrise or sunset. c) only in the summer. d) only in the winter. e) only during the several hours around midnight.
Compare the approximate value for the convective heat transfer coefficient from Equation 10-54 or 10-55 for water boiling on vertical flat surfaces at atmospheric pressure and superheat temperature of 40ºF to the value predicted by using Equation 10-6.
