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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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.
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.
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
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.