2. Ultrasound waves are not matter. They are not beads on a string. Nevertheless, they carry...

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2. Ultrasound waves are not "matter." They are not "beads on a string." Nevertheless, they carry in- formation. What sorts of information can such waves carry? How do we know that they carry this information? Sound and light is carried in waves. 3. Ultrasound devices have two settings, a 'signal-sending' setting and a 'signal receiving' setting. Only one setting is on at a time. Why do you think that might be? Why not just send and receive signals continuously? 4. Ultrasound is useful because sound reflects upon encountering an interface, which is an abrupt change in the medium carrying the sound wave. This encounter produces an echo, just as a person standing in front of a brick wall would hear an echo when he or she claps. The echo is the result of sound reflecting from the wall. Suppose you had a sensitive enough clock that you could measure the time between the sending and receiving of a sound wave. How then might you use ultrasound waves to determine the distance of a fetus from the surface of the body? 2. Ultrasound waves are not "matter." They are not "beads on a string." Nevertheless, they carry in- formation. What sorts of information can such waves carry? How do we know that they carry this information? Sound and light is carried in waves. 3. Ultrasound devices have two settings, a 'signal-sending' setting and a 'signal receiving' setting. Only one setting is on at a time. Why do you think that might be? Why not just send and receive signals continuously? 4. Ultrasound is useful because sound reflects upon encountering an interface, which is an abrupt change in the medium carrying the sound wave. This encounter produces an echo, just as a person standing in front of a brick wall would hear an echo when he or she claps. The echo is the result of sound reflecting from the wall. Suppose you had a sensitive enough clock that you could measure the time between the sending and receiving of a sound wave. How then might you use ultrasound waves to determine the distance of a fetus from the surface of the body?