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

Which phrases describe an irregular galaxy? Check all that apply. has a round shape contains many young stars contains a lot of gas and dust has arms that extend from the center is smaller than other types of galaxies

When a wave enters a new medium, it may speed up or slow down. What other properties of the wave do you think might change when it enters a new medium?

You do work on a body when you lift it against gravity. How does this work relate to gravitational potential energy? If the lifted body is dropped, what becomes of this energy?

Dimension for electric charge

On a very muddy football field, a 110kg linebacker tackles an 85kg halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.8m/s north and the halfback is sliding with a velocity of 7.2m/s east. A.

Which process best describes part of a scientific investigation? O designing a solution O evaluating the conclusion O evaluating the solution O identifying the conclusion

How many neutrons are in Cesium-130

You are standing outside during the daytime. How can you see a blade of grass? A. Light is produced by your eyes and travels out to the grass. B. Light is produced by the grass and travels straight to your eyes. C.

Are cosmic rays and gamma rays invisible or do they have color?

What element has the lowest electronegavity?