IUB PHYS-P 105 - Sound Wave (2 pages)

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Sound Wave

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Sound Wave


diffraction, reflection and speed of sound wave

Lecture number:
Lecture Note
Indiana University, Bloomington
Phys-P 105 - Basic Physics of Sound

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PHYS 105 1nd Edition Lecture 7 Outline of Last Lecture I Waves and Superposition Outline of Current Lecture II Sound Wave III Intensity and Power IV Reflection Refraction and Diffraction Current Lecture I Sound Wave Longitudinal pressure wave that travels in solid liquid or gas 3 important characteristics o Loudness Related to amplitude o Pitch Determined mainly by frequency o Timbre Related to frequency content of a sound wave Speed of sound wave in idea gas yRT o v M T 273 t this is absolute temperature o J y R 8 31 o constants of gas mol K o M molecular weight of gas Intensity and Power Intensity Power Unit area Power Work Time Peak Intensity of a sound is related to the peak sound pressure by II I p2 pc p peak pressure wave amplitude p 2 o p density of a medium pc o o c speed of sound wave Sound power is equal to the sound intensity times the area of the acoustic wave Inverse Square Law o Sound wave from a point source radiates outward uniformly over a sphere These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Power P Area 4 r 2 Reflection Refraction and Diffraction Reflection o Wave reflection from a curved barrier can be focused onto a point o Wave reflected from a fixed end has 180 phase shift o Wave reflected from an open end does not have phase shift Refraction o Waves travel through a different medium with a different wave speed will change the direction of travel Temperature inversion o Temperature closer to ground is colder o Temperature higher up is warmer o Speed of sound at high altitude from ground is faster than speed close to ground Diffraction o When wave encounters obstructions it can bend around the obstacle or pass through narrow opening o III I

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