Q1. A 1.86- sound wave travels through the pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as heart beats. The reflected sound is after that mixed with the transmitted sound, and 80 beats per second are detected. The speed of sound in body tissue is 1610.
Q2. The plates of a parallel-plate capacitor are 3.60 apart, and each carries a charge of magnitude 77.0. The plates are in vacuum. The electric field between the plates has a magnitude of 5.00×10^6. Is the potential difference between plates?