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24 Cards in this Set

  • Front
  • Back
Q
What is intensity
A
The amount of energy a sound wave carries per second through a unit area.
Q
What unit iws used to measure intensity?
A
watts per square meter (W/m²)
Q
What is loudness?
A
How strong (intense) a sound seems to the listener.
Q
What is another way to say loudness?
A
sound level
Q
How are loudness and intensity related?
A
The greater the intensity of the sound wave - the louder it sounds.
Q
What units are used to measure loudness?
A
decibels (dB)
Q
What happens to your hearing at 200 dB?
A
immediate and irreversible hearing loss
Q
For each increase of 10 dB, how much louder is the sound?
A
The sound is ten times (10 x) louder. (example: 60 dB is ten times louder than 50 dB)
Q
What is frequency?
A
The number of vibrations that occur per second?
Q
What unit is used to measure frequency?
A
hertz (Hz)
Q
What does Hz represent?
A
the number of waves (vibrations) per second (#w/sec)
Q
What is pitch?
A
how low or high a sound seems to a person
Q
What is the relationship between pitch and frequency?
A
The pitch of a sound depends on the frequency of the sound wave. (high frequency - high pitch, low frequency - low pitch)
Q
What frequencies can the average person hear?
A
20 Hz to 20,000 Hz
Q
What do you call a sound too high for normal hearing?
A
ultrasound
Q
What do you call a sound too low for humans to hear?
A
infrasound
A
higher than 20,000 Hz
Q
What are the frequencies for ultrasound?
Q
What are the frequencies of infrasounds?
A
lower than 20 Hz
Q
What is resonance?
A
the increase in the amplitude of vibration af an object when external sound waves match the object's natural frequency.
Q
For resonance to occur, what property of of both the object and the sound wave must be the same?
A
The sound wave must have the same frequency as the natural frequency of the object.
Q
What is the Doppler effect?
A
The apparent change in frequency when a wave source and listener are MOVING closer together or further apart.
Q
What happens to a sound when the source is quickly moving towards the listener?
A
The pitch appears to increase because of the Doppler effect.
Q
What happens to a sound when the source is quickly moving away from the listener?
A
The pitch appears to decrease because of the Doppler effect.
Q
When does a sonic boom occur?
A
When a plane goes faster than the speed of sound, the sound waves that were piled up in front of it are released as a shock wave and are heared as a loud noise.