Shown following are five different colors of visible light that travel to Earth from the Sun. Rank these colors of visible light from left to right based on the altitude in the atmosphere where they are completely absorbed, from highest to lowest (Earth’s surface). If two (or more) of the choices reach the surface, rank them as equal by dragging one on top of the other(s).
Answer: All are equal
Explanation: As your correct answer indicates, all wavelengths of visible light reach Earth's surface, which is why we can see all colors and why visible-light telescopes work fine on the ground.
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About a thousand trillion neutrinos are passing through your body every second. Why don't they hurt you?
A) Neutrinos interact with ordinary matter only through the weak force. B) Their masses are too low to cause any damage. C) They are traveling too slowly to cause any damage. D) Our immune systems release antibodies that counteract the damage the neutrinos cause. E) Actually, they do—neutrinos are the cause of many cancers.
Why isn't space expanding within systems such as our solar system or the Milky Way?
A) Hubble's law of expansion applies only to the space between galaxies. B) We are so close to these systems that we don't observe their expansion. C) The universe is not old enough yet for these objects to begin their expansion. D) Their gravity is strong enough to hold them together against the expansion of the universe.
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving upwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb b. 160 lb c. 170 lb d. none of the above
Imagine that we have two identical metal spheres on insulating stands that we give the same negative charge. If we slowly bring the spheres closer and closer together, the charge per unit area ? on each sphere will at the point nearest the other sphere
A. become increasingly negative. B. become less negative. C. remain constant.