If the masses of two planets doubles and the distance between them also doubles, the force between them would be
A) one-quarter.
B) half as much.
C) twice as much.
D) four times as much.
E) none of the above
Answer: E
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A converging mirror with a focal length f forms an image of the moon. Where is the image?
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A diffraction grating has 6.00 × 103 lines per centimeter ruled on it
What is the angular separation between the second and the third orders on the same side of the central order when the grating is illuminated with a beam of light of wavelength 550 nm? A) 20.5° B) 30.5° C) 40.6° D) 50.5°