Podcast
Questions and Answers
What is the approximate speed of sound in air at 15 degrees Celsius?
What is the approximate speed of sound in air at 15 degrees Celsius?
- 3400 m/s
- 340 m/s (correct)
- 150 m/s
- 1500 m/s
Sound travels slower in water than in the air.
Sound travels slower in water than in the air.
False (B)
What is the range of audible frequencies for the human ear?
What is the range of audible frequencies for the human ear?
- 2 kHz to 200 kHz
- 2 Hz to 2 kHz
- 20 Hz to 20 kHz (correct)
- 200 Hz to 200 kHz
What unit is used to measure sound intensity level?
What unit is used to measure sound intensity level?
Which of the following determines the pitch of a sound?
Which of the following determines the pitch of a sound?
Sound intensity and sound intensity level are the same thing.
Sound intensity and sound intensity level are the same thing.
A sound with a frequency of 100 Hz is generally considered a ______-pitched sound.
A sound with a frequency of 100 Hz is generally considered a ______-pitched sound.
What does a sound level meter measure?
What does a sound level meter measure?
If the period of a sound wave is 0.02 seconds, what is its frequency?
If the period of a sound wave is 0.02 seconds, what is its frequency?
Ultrasounds are audible to humans.
Ultrasounds are audible to humans.
The time it takes for one complete cycle of a repeating sound signal is known as the ______.
The time it takes for one complete cycle of a repeating sound signal is known as the ______.
Which animal is known to use ultrasounds for navigation?
Which animal is known to use ultrasounds for navigation?
Write the formula used to calculate the frequency (F) of a sound wave, given its period (T).
Write the formula used to calculate the frequency (F) of a sound wave, given its period (T).
If sound intensity decreases, the sound intensity level increases.
If sound intensity decreases, the sound intensity level increases.
A microphone converts sound into a varying ______ signal.
A microphone converts sound into a varying ______ signal.
If the period of a sound wave is 10 milliseconds, what is its frequency?
If the period of a sound wave is 10 milliseconds, what is its frequency?
Match the following terms with their corresponding descriptions:
Match the following terms with their corresponding descriptions:
Which of the following scenarios would result in an increase in the measured decibel level?
Which of the following scenarios would result in an increase in the measured decibel level?
How do you determine the period of a sound wave on a tension graph?
How do you determine the period of a sound wave on a tension graph?
Sound intensity is commonly measured in ______ per square meter.
Sound intensity is commonly measured in ______ per square meter.
Flashcards
Speed of Sound in Air
Speed of Sound in Air
The speed of sound in the air at 15 degrees Celsius.
Audible Frequency Range
Audible Frequency Range
The range of sound frequencies that humans can hear.
Ultrasounds
Ultrasounds
Sounds with frequencies above the human hearing range.
Pitch of Sound
Pitch of Sound
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Pitch Correlation
Pitch Correlation
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Microphone
Microphone
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Period of a Signal
Period of a Signal
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Frequency (F)
Frequency (F)
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Sound Intensity Level
Sound Intensity Level
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Sound Intensity
Sound Intensity
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Sound Intensity Increase
Sound Intensity Increase
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Study Notes
Sound Wave Speed
- The speed of sound is approximately 340 meters per second in the air at 15 degrees Celsius.
- Sound travels faster in water than in the air.
Audible Frequencies
- The human ear can perceive sounds between 20 Hz and 20 kHz.
- Sounds outside this range exist, such as ultrasounds, but cannot be heard by humans.
- Bats navigate using ultrasounds, which are above the human hearing range.
Pitch of Sound
- The pitch of a sound refers to whether it is perceived as high (acute) or low (grave).
- Pitch correlates with frequency: high frequency sounds are high pitched, and low frequency sounds are low pitched.
- Pitch is relative; comparing frequencies determines if a sound is higher or lower than another.
Determining Frequency
- The frequency may be provided or derived from a tension graph measured using a microphone.
- A microphone is used to record sound and generates a tension signal that varies over time.
- To find the frequency, determine the period of the signal.
- The period is the time it takes for one complete cycle of the repeating pattern in the signal.
- Measure the period (T) from the start of one motif to the start of the next.
- Calculate the frequency (F) using the formula F = 1 / T.
- Convert the period from milliseconds to seconds before calculating the frequency.
- 10 milliseconds equals 0.01 seconds.
- A sound with a frequency of 100 Hz is considered a low-pitched sound, close to the lowest audible frequencies for humans, although it can be relative.
Sound Intensity Level
- Sound intensity level is measured using a sound level meter.
- The unit of sound intensity level is the decibel (dB).
- Higher decibel values indicate louder sounds.
- Sound intensity level should not be confused with sound intensity, which is related to the sound power.
- Sound intensity is measured in watts per square meter.
- If sound intensity increases, the sound intensity level also increases.
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