Electromagnetic radiation with a frequency of 8.6 x 1014 hz incident on an unknown metal surface causes ejection of photoelectrons with kinetic energies of 1.3 x 10-19 j. what is the unknown metal?

Provide a general expression to clearly describe how to use yourknowlegde of an atom's composition to determine the sign and magnitude of its chargge

Ionic bonds form when electrons are

If you push on a closed door, the door pushes back against you with

The first four steps in the formation of the sun are listed below. 1. a cloud of gas and dust called nebula spins slowly. 2. the nebula collapse due to condensation of gases 3. the cloud spins faster as it collapses. 4.

A car accelerated at a rate of 3ft/s^2 for 2 seconds. at the end of this time period the velocity of the car was 55ft/s what was the car's velocity before it started to accelerate?

Can hand sanitizer be used as rubbing alcohol

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?