Describe two ways in which an atom can be excited. What will ...

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Describe two ways in which an atom can be excited.
 
  What will be an ideal response?

Question 2

The force of gravity from one object extends to infinity never going to zero. When we say that gravitation is universal we mean that
 
  a. the Earth exerts gravitational force on objects on its surface.
  b. the Earth exerts a gravitational force on its Moon and vice versa.
  c. the Earth, Moon, and Sun exert gravitational forces on each other.
  d. all material objects in the universe exert gravitational forces on one another.

[elyse44]

Answer to Question 1

An atom can become excited through collisions with other atoms, which happens very often in a hot gas, where atoms move rapidly and collide often. An atom can become excited by absorbing a photon. Only a photon with exactly the right amount of energy can move the electron from one level to another.

Answer to Question 2

d

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Gracias!

[dantucker]

Excellent