Refracting Telescope: The length of a telescope is 2.00 m and the focal length of the objective lens is 2.0 cm. What is the focal length of the eyepiece?
A. 200 cm
B. 202 cm
C. 101 cm
D. 2.0 cm
E. 198 cm
Answer: E
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Which of the following statements is true of the spectral sequence?
A) It is classified in groups labeled A through Q. B) M stars are cooler and fainter than L dwarfs. C) Y dwarfs are a class of objects with temperatures above 500 K. D) O stars are the hottest, and M stars are the coolest.
Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be
a. less than 3 solar masses. b. more than 3 solar masses. c. between 0.4 and 1.4 solar masses. d. less than 0.4 solar masses. e. not larger than the masses of the stars that we can see.
Why have very few planets with low mass (comparable to Mars or Mercury) been found?
A) These small planets are very rare. B) Low mass planets do not produce large enough radial velocity changes in their stars. C) High mass planets are blocking our views of low mass planets. D) Hot Jupiters have ejected most low mass planets from their solar systems. E) Low mass planets are too far from their parent stars to receive enough light to make them visible from Earth.
What is the orbital angular momentum quantum number for a d subshell?
A. 10 B. 7 C. 4 D. 3 E. 2