1. For the discussion of interference and standing waves, you
need to review the trignometric identity sin a + sin b = 2 sin
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
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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