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Physics
Physics
Problem
The displacement of particles in a string stretched in the
x
x
x
-direction is represented by
y
y
y
. Among the following expressions for
y
y
y
, those describing wave motion are : a.
cos
k
x
sin
ω
t
\cos kx \sin \omega t
cos
k
x
sin
ω
t
b.
k
2
x
2
−
ω
2
t
2
k^2 x^2 - \omega^2 t^2
k
2
x
2
−
ω
2
t
2
c.
cos
2
(
k
x
+
ω
t
)
\cos^2(kx + \omega t)
cos
2
(
k
x
+
ω
t
)
d.
cos
(
k
2
x
2
−
ω
2
t
2
)
\cos (k^2 x^2 - \omega^2 t^2)
cos
(
k
2
x
2
−
ω
2
t
2
)
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