1.

Which of the following , taken by itself, would be decreasing the rate at which energy is transferred by a way travelling along a straight ?

Answer»

reducing the linear MASS density of the string by one half
double the wavelength of the wave
doubling the tension in the string.
doubling the amplitude of the wave.

Solution :AB
`((dE)/(dt))_(AV)=(1)/(2)muvomega^(2)A^(2)=(1)/(2)mu((f)/(LAMBDA))omega^(2)A^(2)=(1)/(4pi)mu(omega^(2))/(lambda)A^(2)`
`((dE)/(dt))_(av)=(1)/(2)SQRT(Tmu)omega^(2)A^(2)`
`v=sqrt((T)/(mu))`


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