What medical technique uses sound wave pulses and their reflections to map structures and organs inside the body?

a. sonar

b. infrasound

c. ultrasound

d. radar

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Two thin 80.0- cm rods are oriented at right angles to each other. each rod has one end at the origin of the coordinates, and one of them extends along the x- axis while the other extends along the yaxis. the rod along the x- axis carries a charge of - 15.0 μ c distributed uniformly along its length, and the other rod carries 15.0 μ c uniformly over its length. find the magnitude and direction of the net electrical force that these two rods exert on an electron located at the point (40.0 cm, 40.0 cm). (e

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds