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A spaceship from a friendly extra-galactic planet flies toward Earth at 0.201 of the speed of...
5. An alien spaceship is racing towards the Earth at a speed of 3000 km/s and shines a laser beam at the Earth. The laser has a “rest wavelength” of 5500A. Standing on Earth, at what wavelength would you observe the laser ˚ beam?
A rocket flies toward the earth at 0.5c and the captain shines a laser light beam in the forward direction. Part A Which of the following statements about the speed of this light are correct? (There may be more than one correct answer.) Check all that apply. Check all that apply. A The captain measures speed c for the light. B An observer on earth measures speed c for the light. C The captain measures speed 0.5c for the light....
A spaceship is moving away from Earth at speed 0.20c. A source on the rear of the ship emits light at wavelength 450 nm according to someone on the ship. What is the wavelength of the light observed by someone on the Earth?
An astronomer observed electromagnetic waves emitted by oxygen atoms in a distant galaxy moving toward Earth at a speed of 2.467 times 10^7 m/s. In the laboratory on Earth, oxygen atoms emit waves that have a frequency of 5.841 times 10^14 Hz. At what frequency does the astronomer observe the light emitted by oxygen atoms from the distant galaxy? A certain metal has a work function for photoelectric emission of phi delta = 3.50 eV. What is the threshold frequency...