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15.72:
a)
m
800
.
0
)
Hz
0
.
240
(
s)
m
0
.
192
(
=
=
=
λ
f
v
, and the wave amplitude is
cm.
400
.
0
SW
=
Α
The amplitude of the motion at the given points is (i)
2)
sin(
cm)
(0.400
(ii)
node),
(a
0
)
(
cm)sin
400
.
0
(
π
π
=
antinode)
(an
cm
0.004
=
cm.
0.283
4)
sin(
cm)
(0.400
(iii)
and
=
π
b). The time is half of the period, or
s.
10
08
.
2
)
2
(
1
3

×
=
f
c) In each case, the maximum velocity is the amplitude
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