The Physics of Speakers and Microphones

How do speakers increase their pitch?

• Increasing how fast the cone moves in and out

• Increasing the amount of beads in the cone

• Increasing how fast the cone vibrates

• Increasing the voltage of the speaker

What kind of speaker cone produces a lower range of frequencies?

• Boofer

• Woofer

• Twooter

• Goober

What is the proximity effect?

• Frequency decreases with distance

• Resonance increases with distance

• Wavelength increases with distance

• Amplitude and low frequency sounds decrease with distance

What is the best place to put a speaker to prevent diffractive interference?

• Near a corner

• Near a mirror

• Away from corners

• Inside a box

How do microphones record sounds?

• They measure the vibration of their cone

• They turn electrical signals into soundwaves

• They measure changes in pressure applied to their diaphragm

• They cause the soundwaves to undergo total internal reflection

Why do speakers cause tables to buzz sometimes?

• The sound is recorded too close to the speaker

• The speaker emits the resonant frequency of the table

• The cone of the speaker vibrates too much

• The soundwaves diffract off the edges of the table

The fact that sound comes from different directions into a microphone's mesh causes it to:

• Diffract unevenly

• Diffract evenly

• Not diffract

• Undergo total internal diffraction

How is surround sound created?

• Creating speakers with differently sized cones and placing them next to each other

• Positioning speakers so that some waves reflect off of other surfaces, entering the ear from another direction

• Placing a reflector behind the speakers so that missed waves are reflected back to the listener

• Causing speakers to emit their resonant frequencies