Figure shows a snapshot for a travelling sine wave along a string. Four elemental portions $a, b, c$ and $d$ are indicated on the string. The elemental portion which has maximum potential energy is/are
A$a$
B$b$
C$c$
D$b$ and $d$
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A$a$
a (a)
Maximum potential energy is stored where kinetic energy, i.e., velocity is zero as the total energy of an element of a wave is constant in its oscillating direction.
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$Assertion :$ Two waves moving in a uniform string having uniform tension cannot have different velocities.
$Reason :$ Elastic and inertial properties of string are same for all waves in same string. Moreover speed of wave in a string depends on its elastic and inertial properties only.