1.  Why does clapping your han

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1.  Why does clapping your hands produce a sound? a.  It rapidly compresses the air between your hands and forms a sound wave. b.  It releases many small skin particles into the air and forms a sound wave. c.  It creates friction between your hands and forms a sound wave. d.  It compresses the skin molecules and forms a sound wave. 2.  If you shine a light past a wall and into a room, what will diffraction cause the light to do?  a.  Illuminate an area that is the same size as the original light beam b.  Spread out the light and illuminate a larger area than the original beam c.  Split the light to illuminate two areas equal in volume to the original beam d.  Concentrate the light to illuminate a smaller area than the original 3.  What is a common application of ultraviolet light? a.  heat lamps b.  night vision c.  heat detectors d.  cooking food 4.  Which statement correctly explains mechanical advantage? a.  It is the factor by which a machine shortens the length of time needed to do a certain job. b.  It is the number of times a machine multiplies the effort force put into the machine. c.  It is the distance over which a machine can move an object in one minute, at a set speed. d.  It is the amount of force needed by a machine to double the efficiency of the machine. 5.  How does knocking on a door produce a sound? a.  The knock compresses the air between the person's hand and the wood. b.  The knock compresses the particles of wood and releases sound energy. c.  The knock changes the potential energy of the door into sound energy. The knock causes the door to vibrate, which then causes the air to vibrate.

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