Aprobe orbits the black hole in problem 1 from a distance of 500 m above the event horizon. it gives off a signal as a gamma ray with a wavelength of 0.005 nm. if you are an observer very far away from the black hole, at what wavelength and frequency do you detect signal?

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Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor. b. increased mechanization has increased the need for water, thereby increasing the need for labor. increased mechanization has increased the use of land, thereby increasing the need for labor. d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.

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