Which of the following best describes why we say that light is an electromagnetic wave?
the passage of a light wave can cause electrically charged particles to move up and down.
the term electromagnetic wave arose for historical reasons, but we now know that light has nothing to do with either electricity or magnetism.
light can be produced only by electric or magnetic appliances.
light is produced only when massive fields of electric and magnetic energy collide with one another.
the passage of a light wave can cause electrically charged particles to move up and down.

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

What is a possible result of higher air temperature caused by global warming