Is energy absorbed or given off when an electron and a hole of a semi-conductor crystal

recombine? What are the forms of energy that can be absorbed or given off?

When you see Marjorie, she is swinging a bucket of water around in a circle. The speed of the bucket of water does not change as it moves in the circle.

Let R be the distance between the cylinder and the center of the turntable. Now assume that the cylinder is moved to a new location R/2 from the center of the turntable.

Light travels 300,000,000 m/s, and one year has approximately 32,000,000 seconds. a light year is the distance light travels in one year. state the speed in km/s, using scientific notation

A city bus travels along its route from Jackson Street 8 km to Aurora Avenue, where it turns and continues 13 km. What is the total distance that the bus has traveled? km

Which statement is true about effective nuclear charge? a. Effective nuclear charge decreases as we move to the right across a row in the periodic tableb. Effective nuclear increases as we move to the right across a row in the periodic tablec.

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies

Beth made the chart shown. A 2-column table with 1 row. The first column labeled X has entries Wall clock, T V remote control, Portable music player. The second column labeled Y has entries Refrigerator, Table lamp, Hair dryer.

Which sentence states Newton's third law? If two objects collide, each object exerts a force in the same direction as the other. If two objects collide, each object exerts a force equal to and in the opposite direction of the other.

Why did the chicken cross the road.