## Lecture 11: Interference

February 22, 2018

• Study: Exs 14.5; Supp. Exs 1-3, 1-4, 1-5
• Skim: 32.4

### Objectives

• (Continuing objective) Describe applications of the concepts of induction, waves, and light to everyday real life'' situations.
• For interference problems, determine the relative phase difference from path length differences, and use the method of complex phasors to determine the total amplitude and the relative intensity of the combined waves.
• Use the method of phasors to locate maxima and minima in a two-slit interference problem, multi-slit interference pattern, or for diffraction gratings.

### Homework

• Friday's Assigned Problems: A87, A89, A93, A103; CH 14: 36; CH 32: 11, 35, 37; Supp CH 1: 5

Answers: CH 14 #36 every 7.5 seconds

• Monday's Hand-In Problems: A35, A37, A88, A104; CH 14: 40, 68; CH 32: 34; Supp CH 1: 3, 4, 6

### Videos of example problems

To see the problem statement, click on the link below. To play the video example, click on the underlined words "Video Demonstration" near the top of the page with the problem statement.