Which best explains why an mri is useful for diagnosing cancer but ineffective in treating it? the frequency of the radio waves used is so high that the waves cannot be used to target specific cells. the wavelength of the radio waves used is so short that the waves cannot be used to target specific cells. the amount of energy carried by radio waves is enough to provide images but not enough to kill cells. the amount of energy carried by radio waves is so high that it provides images but can also damage cells