Science P5 Unit 2 Sound (2.1 - 2.3) Flashcards
Key terms for Unit 2 (Sound): 2.1 - 2.3
control variable
the variable that does not change throughout the investigation
independent variable
the variable that you change throughout the investigation
dependent variable
the variable that you measure in the investigation
Vibration
a very quick movement back and forth
Sounds are made when things _______.
vibrate
how loud or quiet a sound is.
Volume (of a sound)
the unit we use to measure sound
decibel (dB)
Pitch
describes how high or low a sound is
a device used to measure the volume of sound in decibels.
sound level meter
Slow vibrations produce a _________ sound, fast vibrations produce a _________ sound.
lower-pitched, higher-pitched
How does a singer make the sound of her voice louder using a microphone, an amplifier, and a loudspeaker?
The singer sings into the microphone which is connected to the amplifier. The amplifier makes the sound louder. The amplifier connects to the loudspeaker. The sound comes out through the loudspeaker, making her voice louder.
We can _______ sounds to make it quieter.
muffle
2 examples of ways to muffle sounds
Ear defenders and Silencers
