Physics 122 - LectureDate: 02/05/16

Questions?

Announcements/Reminders

Written HW #03 – Due Now!

Written HW #03 – Due Friday, February 12

MP HW #03 – Due Friday, February 12, by 11:59 pm.

Reading assignment (check website) – Due on 02/08/16.

Last class:

* Transmission and reflection.

* Superposition of waves.

* Standing waves.

Today:

* Standing sound waves.

* Interference of waves.

Example (problem 48 from text)

The velocity of waves on a string is 96 m/s. If the frequency of standing waves is 445 Hz, how far apart are two adjacent nodes?

Question

Slide 21-49

A standing wave on a string vibrates as shown.

Suppose the string tension is reduced to 1/4 its original

value while the frequency and length are kept

unchanged. Which standing wave pattern is produced?

Question

Slide 21-50

A standing wave on a string vibrates as shown.

Suppose the string tension is reduced to 1/4 its original

value while the frequency and length are kept

unchanged. Which standing wave pattern is produced?

Standing waves in air columnshttp://www.acs.psu.edu/drussell/Demos/StandingWaves/StandingWaves.html

Interference of waves

Interference of waves