In addition to producing images, ultrasound can be used to heat tissues of the body for therapeutic purposes. An emitter is placed against the surface of the skin; the amplitude of the ultrasound wave at this point is quite large. When a sound wave hits the boundary between soft tissue and bone, most of the energy is reflected. The boundary acts like the closed end of a tube, which can lead to standing waves. Suppose \(0.70 \mathrm{MHz}\) ultrasound is directed through a layer of tissue with a bone \(0.55 \mathrm{~cm}\) below the surface. Will standing waves be created? Explain.