Q1. A 2.42 MHz sound wave travels through a pregnant woman's abdomen and is reflected from fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as heart beats. The reflected sound is afterwards mixed with the transmitted sound, and 85 beats per second are detected. The speed of sound in body tissue is 1520m/s. compute the speed of the fetal heart wall at the instant this measurement is made.

Q2. The atmosphere of Mars is mostly (molar mass 44.00 under a pressure of 650, which we shall assume remains constant. In many places the temperature varies from 0.0 in summer to - 100 in winter. Over the course of a martian year, what are ranges of the rms speeds of the molecules.