A spaceship is moving away from Earth at a speed of 0.21c. A light source on the rear of the ship emits a light with wavelength 515 nm according to passengers on the ship. What wavelength is detected by someone on Earth watching the ship? Number Units
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- multiple choice question As the velocity of an inertial frame of reference increases with respect to a stationary observer, Einstein's theory of special relativity predicts that the length of an object, measured in the dimension parallel to the motion of the reference frame, will A decrease. B. remain unchanged. Jump to 1 2 3 4 5 6 7 8 9 10 increase. D. increase at first but start to decrease when the speed of the reference frame equals half the speed of light. E. decrease at first but start to increase when the speed of the reference frame equals half the speed of light.George is in a spaceship, speeding away from planet Earth at , where is the speed of light in a vacuum. Anna is on George's ground crew, and she sends out a communication signal to George. Since Anna's communication signal is a radio wave, it is electromagnetic and travels at a speed of relative to Anna. From George's perspective, Anna's signal is approaching him at a speed of? c 0.5c 2c 0A UFO travels at such a speed as to remain above one point on the earth ata height of 200 km above the earth's surface. A radio signal of frequency 110:0 MHz is sent to the UFO. i.What is the shift in the frequency received by the UFO? ii. If the signal was reflected back to earth, what would be the observed frequency of the return signal?
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