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We study the radial oscillations of non-rotating strange stars and theircharacteristic echo frequencies for three Equations of state (EoSs), viz., MITBag model EoS, linear EoS and polytropic EoS. The frequencies of radialoscillations of these compact stars are computed for these EoSs. 22 lowestradial frequencies for each of these three EoSs have been computed. First, foreach EoS, we have integrated Tolman-Oppenheimer-Volkoff (TOV) equationsnumerically to calculate the radial and pressure perturbations of strangestars. Next, the mass-radius relationships for these stars are obtained usingthese three EoSs. Then the radial frequencies of oscillations for these EoSsare calculated. Further, the characteristic gravitational wave echo frequenciesand the repetition of echo frequencies of strange stars are computed for theseEoSs. Our numerical results show that the radial frequencies and also echofrequencies vastly depend on the model and on the value of the model parameter.Our results also show that, the radial frequencies of strange stars are maximumfor polytropic EoS in comparison to MIT Bag model EoS and linear EoS. Moreover,strange stars with MIT Bag model EoS and linear EoS are found to emitgravitational wave echoes. Whereas, strange stars with polytropic EoS are notemitting gravitational wave echoes.

Radial oscillations and gravitational wave echoes of strange stars for various equations of state