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Physics of Sound

  1. The particle executing simple harmonic motion has a kinetic energy K0 cos2 ω t. The maximum values of the potential energy and the total energy are respectively
    1. ​K0 / 2 and K0
    2. K0 and 2K0
    3. K0 and K0
    4. 0 and 2K0.
Correct Option: C

We have, U + K = E ​
where, U = potential energy, K = Kinetic energy, E = Total energy. ​
Also, we know that, in S.H.M., when potential energy is maximum, K.E. is zero and vice-versa. ​ ​
∴ Umax - 0 = E ⇒ Umax = E
Further,

K.E. =
1
2 a2 cos2 ωt
2

But by question , K.E. = K0 cos2 ωt
K0 =
1
2 a2
2

Hence, total energy, E =
1
2 a2 = K0
2

∴ Umax = K0 & E = K0



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