Evan drew a diagram to illustrate radiation

what do the arrows represent

a. gases missing with particles

b. liquid moving through a vacuum

c. moving particles

d. electromagnetic waves

The correct answer to the question is D. Electromagnetic waves.

EXPLANATION:

As per the diagram, the radiations are emitted by sun is coming to earth.

The radiations coming from sun is electromagnetic in nature. It does not require any medium for its propagation. It travels a long distance in vacuum or space to reach earth.

It contains both electric field and magnetic field which are perpendicular to each other and also normal to the direction of propagation. The diagram shows that the wave is moving in the form of crests and troughs.

If we consider the wave nature of radiation, then it is one way of transportation of thermal energy from sun to earth which is known as radiation.

Hence, the arrows drawn in the figure is electromagnetic waves.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.