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