P17 065

background image

65.

(a) Using Eq. 17-52 with L = 120 cm, we find

λ

1

=

2L

1

= 240

λ

2

=

2L

2

= 120

λ

3

=

2L

3

= 80

with all values understood to be in centimeters.

(b) The three standing waves are shown below.


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