On a TV screen, red, green, and blue spots of light produce a full spectrum of colors. What spots are activated to produce yellow? Red? Magenta? White?
What will be an ideal response?
Answer: Yellow is produced by simultaneously activating red and green; red is activated by red only; magenta by red and blue, and white by equal brightnesses of all three of these colors.
You might also like to view...
According to current evidence, Pluto is best described as
A) a large member of the Kuiper belt. B) a terrestrial planet that is surprisingly far from the Sun. C) a small jovian planet. D) an escaped moon of Jupiter or Saturn.
How did star formation likely proceed in the protogalactic cloud that formed the Milky Way?
A) The stars that formed first could orbit the center of the galaxy in any direction at any inclination. B) The stars that formed first eventually settled into a galactic disk, circling the center of the galaxy. C) The protogalactic cloud gradually formed stars, starting from the center of the galaxy working outward. D) The protogalactic cloud gradually formed stars, starting from the outer edges of the spiral arms and working inward.
A rocket in space fires its engines continuously until it runs out of fuel. Describe the motion of the rocket.
A. The rocket's speed is a constant value until the engines stop firing, and then coasts to a stop. B. The rocket's speed increases until its engines stop firing, and then coasts to a stop. C. The rocket does not move, as the engines have nothing to push against. D. The rocket's speed does not change, and it continues to move in a straight line. E. The rocket's speed increases until its engines stop firing, and then coasts in a straight line.
A hydraulic press has its input piston depressed 20 centimeters while the output piston is raised 1 centimeter. A 1-newton input can lift a load of
A) 1 N. B) 10 N. C) 15 N. D) 20 N. E) none of the above