Physics 272: Honors Physics II
Spring 2017

Wednesday 1 February 2017: Topics to be covered in the lecture (HRW sections 16.7, 17.1-4, 17.6)

1. For the discussion of interference and standing waves, you need to review the trignometric identity sin a + sin b = 2 sin ((a+b)/2) cos((a-b)/2).
Do quizlet question 1.

2. As we will discuss in more detail in class, a string stretched between two fixed endpoints can undergo motion, called a standing wave, in which all the elements move tranaverse to the string in SHM with the same frequency, but with different amplitudes. Points at which the amplitude is zero, called nodes, are spaced at equal distances. Since the endpoints are fixed, there must be nodes at the endpoints.
Do quizlet question 2.

3. Logarithmic scales are useful to measure quantities that can vary by many orders of magnitude. Carefully read the section "The Decibel Scale" on p. 490 of the book.
Do quizlet question 3.

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