Ch 12.1 Sound notes.doc

# The energy of a mechanical wave is determined by its

• Notes
• 2

This preview shows 1 out of 2 pages.

The energy of a mechanical wave is determined by its amplitude. Intensity (I): ___________________ of sound at a particular distance from source of sound. Measurable quantity: measured in _________________ ( ______) The greater the ______________ of the sound waves, the ______________ the sound and the higher the decibel value, Loudness is subjective, intensity is not. Humans perceive loudness on a logarithmic scale. A sound seems _______ as loud when its intensity is ______ times the intensity of another sound. Range of sound a human ear can hear? Audible region is ___________ to ______________dB Infrasound: A sound below human hearing range (20 Hz) Ultrasound: A sound above human hearing range (20000Hz). How does extensive exposure to sounds above 120 dB affect people? ___________________________ Table 1 . Fill in intensities of common sounds Table 2: Fill in the hearing range of animals Intensity (dB) Example Frequency Animal 0 dB 6 – 12000 Hz 30 dB 20 – 20000 Hz 50 dB 40 – 46000 Hz 90 dB 70 –150000 Hz 120 dB 150 dB Pitch is determined by frequency of sound waves:

Subscribe to view the full document.

Physical Science Name: ___________________Period: ____ Date: ____ Pitch: Perceived highness or lowness of a sound, subjective, depends on ______________ of sound waves. A ___________-pitched sound corresponds to a high frequency (rapid vibrations, short wavelength) A ___________-pitched sound corresponds to a low frequency (slow vibrations, long wavelength) Musical Instruments: Music instruments produce sound through vibration of ________________, ________ columns, or _____________________. All objects have a natural frequency of vibration vibrates if disturbed by forced vibrations Resonance: an effect in which vibration of one object causes vibration of another object at a natural frequency.
You've reached the end of this preview.
• Fall '15
• bhardwaj

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern