The principle of the photoelectric effect is:

A) the electromagnetic theory of light

B) the special theory of relativity

C) the principle of superposition

D) the quantum theory of radiation

Graph the velocity of a car accelerating at a uniform rate from 7.0 m/s to 12.0 m/s in 2.0 s. Calculate the accerleration

The path in which one object travels around another object in space is called its A. rotation. B. orbit. C. revolution. D. gravitation.

It takes 4 hr 39 min for a 2.00-mg sample of radium-230 to decay to 0.25 mg. What is the half-life of radium-230? A) 1 hr 4 min B) 1 hr 17 min C) 1 hr 33 min D) 1 hr 49 min Eli

Objects 1 and 2 attract each other with a electrostatic force of 72.0 units. If the distance separating objects 1 and 2 is changed to one - halved the original value (i. e, halved), then the new electrostatic force will be

What is the momentum of a two-particle system composed of a 1500 kg car moving east at 30 m/s and a second 900 kg car moving west at 25 m/s? Let east be the positive direction. Answer in units of kg · m/s.

Ursa Minor contains the pole star, Polaris, and the asterism known as the Little Dipper. From most locations in the Northern Hemisphere, all of the stars in Ursa Minor are circumpolar.

What is an organism ability to maintain a steady internal condition called

What is the fundamental frequency of a particular medium?. a. the lowest frequency at which a standing wave is possible. b. the highest frequency at which s standing wave is possible

The distance from the inner core to the surface of the earth is about 5,200 kilometers. the large amount of material surrounding the inner core places tremendous pressure on it.

What type of wave is sound? longitudinal light surface transversal