The retrograde spin of Venus could be the result of a collision with a large planetesimal.
Answer the following statement true (T) or false (F)
True
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If light has a wavelength of 600 nm in a vacuum, what is its wavelength in a material with an index of refraction of 1.50?
A. 600 nm
B. 900 nm
C. 400 nm
D. 
E. 267 nm
Earth is probably the only Solar System object with a liquid ocean.
Answer the following statement true (T) or false (F)
Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age more than people who stay behind on Earth. B) have more fun than people who stay behind on Earth. C) age less than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.
Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 104 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
A. measured by one clock fixed at one spot on Senesca. B. measured by one clock fixed at one spot on the spaceship. C. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting. D. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting. E. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.