Science Final - #2
Terms
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- mechanical
- which waves need matter to transfer energy
- pitch
- high frequency means high__________
- energy
- amplitude reflects the amount of _______in the wave
- amplitude
- high_______means a sound will be loud (volume)
- electomagnetic
- which waves do NOT need matter to transfer energy
- to change electric energy into kinetic energy
- what is the purpose of an electric motor
- compressional
- sound is a ____________wave
- as temperature of a medium increases the speed of sound increases
- what happens to the speed of a wave as the temperature of the medium increases
- to make an electromagnetic, you wrap iron with a current carrying wire. the iron core then becomes magnitized
- how is electromagnet made
- allow electric current to flow through the wire
- how can we create a magnetic field around a wire
- matter where atoms are further apart (gases)
- electromagnetic waves travel fastest through
- alternating current is an electric current that changes direction; direct current flows in only one direction
- what is the difference between alternating current and direct current
- sound is a compressional wave that needs matter to transfer. therefore it will not travel
- do sound waves travel where there is NO matter
- add carpet or drapes
- how can we reduce reverberation in a room
- Doppler Effect
- the ________________involves the change in the pitch of a sound as it is traveling closer to you and farther away from you
- uses magnetism to change kinetic energy into electric energy
- what is the purpose of a generator
- matter where atoms are close together ( solids)
- mechanical waves travel fastest through
- moving a magnet in and out of a coil of wire
- how can we create current using only wire and a magnet
- if a singer sings at the same natural frequency as the glass, the glass will begin to vibrate. If the singer continues, the glass will eventually vibrate until it shatters
- how can a singer shatter glass
- yes
- do all wave carry energy
- wave length, frequency, amplitude, wave speed
- what are the 4 characteristics of waves that can change