• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/24

Click to flip

### 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.