A vet is using an ultrasonic motion detector to detect the heartbeat of an unborn chimp baby and claims that the speed of sound in the soft tissue of a chimp should be 1489 m/s. According to the manual which comes with the motion detector, the emitted frequency of sound waves from the motion detector is 1.97 MHz (M is mega or 106). You ask the vet to estimate the number of heartbeats per minute for the tiny heart of the chimp fetus, and you also ask her to estimate the range of motion of the heart wall as it goes back and forth. She says that the expected values would be about 121 heartbeats per minute and, for the range of motion, about 2.05 mm. Assuming that the heart wall moves in Simple Harmonic Motion, what is the maximum speed of the heart wall during any cycle, in mm/s?
The Attempt at a Solution
I calculated the amplitude of this longitudinal wave by dividing the range of the motion by 2. When i first read this problem, I just thought that the maximum speed is the speed of sound, but that's not right. It doesn't have to do with intensity does it? Jeez i feel dumb haha.