Year 9 Physics 2015 Name : shani Lewis Date: 21.08.2015
Q Marks
1 2 What is an echo? Explain why an empty room will produce one? [2 marks]
An echo is a reflection of sound, arriving at the listener sometime after the direct sound. A true echo is a single reflection of the sound source. The time delay is the extra distance divided by the speed of sound.
2 5 Explain how sonar works and why it is useful. Provide at least one diagram or picture. [5 marks]
Sonar is simply making use of an echo. When an animal or machine makes a noise, it sends sound waves into the environment around it. Those waves bounce off nearby objects, and some of them reflect back to the object that made the noise. 3 5 Pick an example of radar and explain how
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(Children can generally hear higher-pitched sounds than their parents, because our ability to hear high frequencies gets worse as we get older.) Speaking more scientifically, we could say that the sounds we can perceive have a frequency ranging from 20–20,000 hertz (Hz). A hertz is a measurement of how often something vibrates and 1 Hz is equal to one vibration each second. The human voice makes sounds ranging from a few hundred hertz to a few thousand hertz. Ultrasound is usually used to track progress on things such as an unborn child’s growth whilst in the womb, or growth of cancer tumours and much more.
5 3 Describe ONE of the following: Sonagraph, 3D ultrasound, Doppler ultrasound [3 marks]
3D ultrasound is a medical ultrasound technique, often used in obstetric ultrasonography (during pregnancy), providing three-dimensional images of the fetus. There are several different scanning modes in medical and obstetric ultrasound. The standard common obstetric diagnostic mode is 2D scanning.[1] In 3D fetal scanning, however, instead of the sound waves being sent straight down and reflected back, they are sent at different angles.
5 Bibliography: (source for each
A sound wave is a disturbance that repeats regularly in space and time and that transmits energy from one place to another with no transfer of matter. In Activity 2 on page 8 we had to model sound waves using an instrument. In our class we used a flute as the example and when the person blew into it, sound waves were produced. As they blew and changed the volume and pitch the sound waves changed. A sound wave is created when something vibrates. When something vibrates, longitudinal waves are created which we can hear. A longitudinal wave is a wave that transfers energy through compressions and rarefactions in the material that the wave travels which are all parts of a sound wave. In Activity 2 it states in some parts of the wave, the air molecules
Diagnostic medical sonography is a profession where sonographers direct high-frequency sound waves into a patient’s body through the use of specific equipment to diagnose or monitor a patient’s medical condition. As described by the Bureau of Labor Statistics, this examination is referred to as an ultrasound, sonogram, or echocardiogram. The high-frequency sound waves emitted from the handheld device, called a transducer, bounce back creating an echo and therefore produce an image that can be viewed on the sonographers computer screen. This image provides the sonographer and physician with an internal image of the patient’s body that will be used in the diagnosis. The most familiar use of ultrasound is used in monitoring pregnancies
A diagnostic medical sonographer is also known as an ultrasound technologist, or simply a sonographer. They use high-frequency sound waves, which are an offshoot of World War two sonar technology, to produce images of the internal body (“Diagnostic” 162). This picture is shown when the sound waves bounce off the internal body, and then become echoes that are now displayed as a two-dimensional black and white image on video. These images are then studied by a physician who studies the function of organs. A sonographer not only completes procedures for pregnant women as it is most known, but also for cysts, abdominal tumors, and the functions of blood vessels and heart valves.
Diagnostic medical sonography is a profession where sonographers direct high-frequency sound waves into a patient’s body through use of specific equipment to diagnose or monitor a patient’s medical condition. As described by the Bureau of Labor Statistics, this examination is referred to as an ultrasound, sonogram, or echocardiogram. The high-frequency sound waves emitted from the handheld device, called a transducer, bounce back creating an echo and therefore produce an image that can be viewed on the sonographers computer screen. This image provides the sonographer and physician with an internal image of the patient’s body that will be used in diagnosis. The most familiar use of ultrasound is used in monitoring pregnancies, and is
Diagnostic medical sonographers play a key role in the health care team and often work alongside doctors, nurses, and other technologists. They prepare patients by explaining the procedure and collect necessary patient history information prior to examination. An ultrasound is then performed, which is a non-invasive process that enables sonographers to send high-frequency sound waves into the body. The return signals are then analyzed to help visualize internal organs in 2D, 3D or 4D. These images help physicians with medical diagnoses and are also used for monitoring pregnancy. An ultrasound is often executed on many different areas of the body including the abdomen, pelvis, tissues, and vascular and cardiac systems. A DMS may also be required
The Diagnostic Sonography more commonly known as Ultrasound is a medical procedure in which you use high frequency sound waves to produce visual images of organs tissues or blood flow inside the body. Ultrasound is regularly known as the procedure used to examine women who are expecting. Although, Sonography is used in many different ways other than for expectant mothers. Sonography is also used to detect such things as heart disease, heart attacks, and vascular disease that can lead to stroke. (SDMS, 2010) Moreover, Sonography is also used to examine breasts, abdomens, female reproductive systems,
Sonography utilizes sound waves to generate an image that can be analyzed to determine or rule out a diagnosis. Ultrasound or ultrasonography is a medical imaging technique that uses high frequency sound waves. It is a high pitch frequency that cannot be heard by the human ear. A diagnostic medical sonographer works directly with patients in a dimly lit room with imaging machines. The sonographer gets the medical history of the patient and prepares the patient for an ultrasound examination. The sonographer explains the noninvasive procedure and answers any question the patient might have. The sonographer positions the patient and covers the patient only exposing the area needed for the procedure. The sonographer
To begin, 3-D ultrasound configures the sound wave data into 3-D images and 4-D ultrasound is considered a version of 3-D ultrasound that shows motion (Radiological Society of North America). Another type of examination is a Doppler ultrasound may be part of an examination. Doppler ultrasounds use a special technique that assesses blood flow through blood vessels, including the body’s major arteries and veins in the legs, neck, and abdomen. Under the Doppler ultrasound, there are three more types: Color, Power, and Spectral (Radiological Society of North America).
2D Ultrasound Images: Also known as sonography, ultrasounds work by using sound waves to develop an image of what's inside the body—in this case, a baby! When you think of a stereotypical pregnancy ultrasound, this is probably what comes to mind. The 2D ultrasound technique has been used for years and provides a two-dimensional,
Sound is a wave, and a wave can be remembered as a medium, carrying energy from one point to another. The sound wave has a resemblance of a slinky in its nature, for many reasons. The disturbance goes from one place to another, carried by the medium. Typically, the medium will carry energy through the air, although it could be any substance like water and steel. There is an original source of the wave; anything from someone’s vibrating vocal chords, or a tuning fork. Then, the sound is transported through the medium through particle-to-particle interaction. If the sound wave is moving through the
Ultrasound imaging has many uses in medicine, from confirming and dating a pregnancy to diagnosing certain conditions and guiding doctors through precise medical procedures
This includes a range of echolocation clicks in the dolphin sonar system used to identify objects underwater.
The sound waves are produced by a random oscillating crystal, and are inaudible to humans. A instrument called a
Ultrasound or ultrasonography is a medical imaging technique that uses high frequency sound waves. It is a high pitch frequency that cannot be heard by the human ear. In ultra sound the following happens: High frequency sound pulses (1-5megahertz) are transmitted from the ultrasound machine into your body using a probe. The sound wave will travel into your body until it hits an object such as soft tissue and bone. When the sound wave hits these objects some of the wave will be reflected back to the probe. While some waves may carry on further till they hit another object and then reflected back. The probe picks up these reflected sound waves and relays them to the machine. The distance and time from the probe,
Sound is apart of our everyday lives. Regardless of if it's the sound of a leaking water faucet, the tapping of a pencil or even the whistling of wind, we’re surrounded by the physics of sound at all times. Sound waves come in various