Which of the following best describes the Tropic of Cancer?
A) It is the circle of latitude on Earth for which the Sun appears to remain above the horizon for a full 24 hours on the summer solstice.
B) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the spring and fall equinoxes.
C) It is the line of right ascension passing through the constellation of Cancer.
D) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the summer solstice.
D
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The star Alpha Centauri A is the same type of star as the Sun, but its luminosity is about 1.6 times that of the Sun. What can we conclude?
A) Alpha Centauri A must have a vastly different interior structure than the Sun. B) Alpha Centauri A fuses hydrogen into helium in its core at a higher rate than our Sun. C) Alpha Centauri A has a much higher surface temperature than the Sun. D) Alpha Centauri A is much farther from Earth than the Sun.
A telescope has an angular magnification of 250 when used with a 20 mm eyepiece. What is the focal length of the objective lens?
A) 5.0 cm B) 25 m C) 5000 cm D) 5.0 m E) 2.5 m
Resolution: Suppose your telescope has perfect mirrors and is limited only by diffraction. If you are viewing with light of 400 nm wavelength, what diameter mirror in a space telescope would have 1.0-km resolution of objects on Mars when viewed from above the earth at a time when the Earth-Mars distance of 80 million kilometers?
A. 39 km B. 3.9 m C. 3.9 km D. 39 m E. 390 m
The sky is blue due to air molecules scattering sunlight in all directions
a. True b. False Indicate whether the statement is true or false