Two starships, the Enterprise and the Constitution, are approaching each other head-on from a great distance. The separation between them is decreasing at a rate of 772.5 km/s. The Enterprise sends a laser signal toward the Constitution. a. If the Constitution observes a wavelength λ=675.3nm, what wavelength was emitted by the Enterprise?
b. If a microwave oven produces electromagnetic waves with a frequency of 2.75 GHz, what is their wavelength?

Urgent pls a. coal consumption levels off and remains flat. b. petroleum, natural gas, and renewables show an increase in consumption c. more nonrenewable resources continued to be consumed than renewable. d. there is little projected increase in nuclear energy use. e. carbon dioxide emissions are projected to decline as we approach 2040. global energy consumption is defined as the total energy used by an individual or organizations from around the world. use the graph above to analyze the projected energy consumption from now until 2040. which statements in the prompt apply? a) a, b, d b) b, c, d c) a, c, d d) a, b, c, d