(a) A scientist measures the speed of sound in a monatomic gas to be 449 m/s at 20C. What element does this gas consist of? (b) A medical ultrasound imaging system sends out a steady stream of very short pulses. To simplify analysis, the reflection of one pulse should be received before the next is transmitted. If the system is being used to create an image of tissue 12 cm below the skin, what is the minimum time between pulses? How many pulses per second does this correspond to?
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