Ultrasound Images: about various ultrasound images for diagnostics. X-rays Modern medicine relies heavily on a variety of imaging techniques. They generate pictures of the interior of the human body for diagnostic purposes. The oldest of these imaging techniques is radiography. It generates pictures by irradiating the body with X-rays and recording the shadows of the internal … Read more
A sound wave is intense and loud if it has a large amplitude. However, the amplitude of a sound wave is hard to measure directly, and it is more convenient to reckon the intensity of a sound wave by the energy it carries. The intensity of a sound wave is defined as the energy per … Read more
The inner ear is a complex system of fluid-filled cavities in the temporal bone. Among these cavities are the three semicircular canals, whose function is not hearing, but rather the detection of movements of the head. The organ of the inner ear concerned with hearing is the cochlea, a tube of about 3.5 cm coiled … Read more
The middle ear is an air-filled cavity in the temporal bone of the skull. The cavity is connected to the nasopharynx by the Eustachian tube; this tube permits equalization of the air pressure in the middle ear with the external atmospheric pressure. The middle ear contains three small bones or oscines: the hammer, the anvil, … Read more
The ear performs the task of converting the mechanical oscillations of a sound wave into electric nerve impulses. Thus, it is similar to a microphone, which also converts the mechanical oscillations of sound into electric signals. However, the ear is unmatched in its ability to accommodate a wide range of intensities of sound. The human … Read more
What is sound wave? A sound wave in air consists of alternating zones of low and high density. The vibrating diaphragm of a loudspeaker generates such zones of alternating density. The alternating zones of low density and high-density travel to the right away from the source. However, although these density disturbances travel, the air as … Read more
What is Work? To introduce the definition of work done by a force, we begin with the simple case of motion along a straight line, with the force along the line of motion, Consider a particle moving along a straight line, say, the x-axis, and suppose that a constant force F, directed along the same … Read more
Newton’s Laws of Motion Learning Objectives On completion of this lesson, you will be able to learn- Newton’s first law of motion Newton’s second law of motion Newton’s third law of motion. Newton’s three laws of motion give the fundamental properties of force and the relationship between force and acceleration. The first of these laws describe … Read more