Sound Characteristics and Properties
What causes sound?
Give some examples of vibrations that cause sounds.
What type of wave is a sound wave?
http://faraday.physics.utoronto.ca/IYearLab/Intros/StandingWaves/Flash/tunefork.html
http://www.physicsclassroom.com/mmedia/waves/tfl.html
http://www.physicsclassroom.com/mmedia/waves/gsl.html
How is a sound wave represented graphically?
http://faraday.physics.utoronto.ca/IYearLab/Intros/StandingWaves/Flash/long_wave.html
What is pitch?
What is the range of frequencies that humans can hear? That we can make? What about other animals?
What is the speed of sound? http://library.thinkquest.org/19537/Physics4.html
What is the general relationship between the speed of a sound wave and its medium?
Sample Problem 1: What is the speed of sound when the temperature is 32°C?
Sample Problem 2: What is the wavelength of a sound when a frequency of 40 Hz moves in air when the temperature is 23°C?
Sample Problem 3: How much time does it take for a sound to travel from the emergency signal speaker at the firehouse to your house 400 m away? Assume the temperature is 10°C and the signal has a frequency of 180 Hz.
Loudness and Intensity
What is loudness?
What is intensity?
What does this graph show?
What is the relationship between loudness and intensity?
What is the relationship between amplitude and energy?
How does intensity obey the law of conservation of energy?
What is the relationship between intensity and the distance from the source?
What is the lowest intensity of human hearing?
What is intensity level? A decibel?
What is the relationship between intensity and intensity level?
What are some typical intensity levels?
Sample Problem 4: The loudest snore has an intensity of 4.5 x 10-8 W/m2 when measured 0.60 m from the snorer’s mouth. What is the power associated with the record snore?
Human Hearing
http://www.physicsclassroom.com/mmedia/waves/edl.html
What are the main parts of the human ear?
How does the ear hear sounds?
How do people lose their hearing?
What is the sensitivity of the human ear?
1945 Sound Characteristics