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Informal session:

o Tu 3:30-4:20pm, RAS 218; (Next Tuesday last meeting)

Lecture 37(iq33)

Standing wave pattern: Along a string, in an organ pipe

Power of transmission: (transverse traveling waves)

Intensity of sound: (longitudinal traveling waves)

Sound level in decibels.

Doppler Shifts: f_det=v_det/l_det

§ Motion of observer: toward, stationary, away

§ Motion of emitter: toward, stationary, away

§ Example: A bat

o step-1: Obs (wall)-stationary; emitter(bat)-toward

o step-2: Obs (bat)-toward; emitter (wall)-stationary

Notice after reflection, the wall becomes a sound emitter.

Reminders:

o Complete reading ch 17. Complete hw13.

o Read ch 18. Begin to work on hw14. Goal complete hw14 as much as possible by the Wednesday before Thanksgiving.

o See the updated syllabus. HW14 is due 4am, Tu (Dec 2, essentially late Mon evening).