A small pulse is generated on a ring rotating with constant angular velocity `omega` as shown in the figure. Then the speed of pulse with respect to ground.

Options

A. `omegaR`
B. `omegaR//2`
C. `2omegaR`
D. zero

Answer

D

Explanation

`2Tsintheta=dmomegat^(2)R`
`approx2Ttheta=mudlomega^(2)R`
`approx2Ttheta=muR^(2)thetaomega^(2)R`
`implies(T)/(mu)omega^(2)R^(2)`
or `v_(wave)=omegaR`
Note `v_(wave)` obtained is always with respect to medium.
`thereforev_("wave/ground")=omegaR-omegaR`
`=0`