For the object shown in Figure $3\mathrm{.}33,$ qualitatively sketch the B$-$mode ultra$-$ sound image. Ignore speckle or scatter and only consider signals backseat$-$ tered from the tissue boundaries. Acoustic impedance: tissue $1\mathrm{.}61,$ tumor $1\mathrm{.}52($x $105$ glcm$2$ s$).$ Attenuation coefficient: tissue $1\mathrm{.}0,$ tumor $0\mathrm{.}4($dB$/$cmIMHz$).$ Speed of sound: tissue $1540,$ tumor $750($rnIs$).$