Imagine you are an astronomer studying the sun, and you are looking at the sun through a telescope -- with a strong filter to protect your eyes of course. while you are gazing at the sun, you see a "flare" on the surface of the sun -- a small but violent eruption that simultaneously emits a lot of light at all wavelengths, from radio waves to gamma rays. how long after you see the flare until the earth is bathed in the dangerous x-rays and gamma rays from this flare? group of answer choices

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s. assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.