Which of the following would you describe as a change in state?

A) melting ice

B) burning paper

C) film being exposed to light

D) a piece of paper being cut in half

The color produced by fireworks is all due to the chemicals inside of the firework itself. Which of these would describe a firework that looked violet?

A beam of monochromatic light illuminates a slit of width w and forms a diffraction pattern on a screen located a distance D ≫ w from the slit. For which color of incident light is the width of the central band greater? blue yellow both are equal

What contributions did J. J. Thomson make to atomic history?

What are some biotic factors in an ocean?

A car traveling 70 miles per hour is 20 miles behind a truck traveling 50 miles per hour. How long will it take the car to overtake the truck?

The path of a beam of light from the sun to your eye when you are wearing sunglasses

The element that is most abundant in earth is

What is true about coal as an energy source

A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? A) 36 m B) 72 m C) 140 m D) 210 m

Which of the following best explains why an explosive charge in a cannon can cause a cannonball to fly out of the cannon with a high velocity? A. because chemical potential energy can convert to gravitational potential energy B.