What is a "super-Earth"?
A) a rocky planet that is more massive than Earth
B) a rocky planet that has more water than Earth
C) a jovian planet that is approximately the same mass as Earth
D) a jovian planet that has a solid surface
E) a rocky planet that is closer to its host star than Earth is to the Sun
A) a rocky planet that is more massive than Earth
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White light is shone on a very thin layer of mica (n = 1.57). When the mica layer is observed from the illuminated side, interference maxima for wavelengths of blue (480 nm) and yellow (560 nm) are observed. What is the thickness of the mica layer?
A. 1.58 ?m B. 0.79 ?m C. 3.16 ?m D. insufficient information is given.
The density of the universe is
a. equal to the critical density if the universe is closed. b. equal to the critical density if the universe is flat. c. greater than the critical density if the universe is flat. d. greater than the critical density if the universe is open. e. none of the above
A small uniform disk and a small uniform sphere are released simultaneously at the top of a high inclined plane, and they roll down without slipping. Which one will reach the bottom first?
A) the one of smallest diameter B) the one of greatest mass C) the disk D) the sphere E) They will reach the bottom at the same time.
Two slits separated by 0.10 mm are illuminated with green light (? = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away
a. 2.3 b. 2.5 c. 2.7 d. 2.1 e. 2.0