At the Earth's north pole, the north celestial pole is directly overhead and stars near the horizon travel in straight lines
a. straight up from the horizon.
b. straight up from the horizon slanting toward the right.
c. straight up from the horizon slanting toward the left.
d. parallel to the horizon.
d
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In a single-slit experiment, light of wavelength 500 nm is used to produce a diffraction pattern on a screen 4.0 m away. If the distance between both 3rd order minima is 6.0 cm, what is the slit width?
a. 
b. 
c. 
d. 
e. 
Describe all that you would see during a total eclipse of the Sun
What will be an ideal response?
When was it first known that Earth was spherical in shape?
A. It was always known to be spherical. B. only after Galileo used a telescope to study other planets C. at the beginning of the Renaissance D. at the time of the Greeks E. only recently within the last hundred years
Which of the following is NOT a method used by astronomers to detect and study exoplanets?
A. direct imaging B. gravitational lensing C. rotational mapping D. doppler shift E. transit detection