SOUND WAVES

SOUND WAVES

1. APPLICATIONS OF REFLECTION OF SOUND WAVES

   • ultrasound (medicine)
     • The reflection of sound = echoes.
       • (Ultrasound waves) used to scan & capture the image of a fetus in a mother’s womb & the image of internal organ in a body. Transmitter P emits ultrasound downwards ~~>> fetus.
         • 1. Detector R receives the ultrasound (echoes) reflected by THE VARIOUS PARTS OF THE FETUS.
         • 2. (soft tissues of the fetus) absorb most of the incident ultrasound, reflect very little.
         • 3. (bony parts) will absorb very little, but reflect most of the ultrasound.
         • 4. (reflected ultrasound) will produce an image of contrasting brightness.
   • sonar
     • is the technique of using ultrasound TO LOCATE UNDERWATER OBJECTS / TO MEASURE THE DEPTH OF A SEABED
       • 1. (Ultrasound signal) is sent out from a transmitter.
       • 2. (Its echo from the seabed) is detected by A RECEIVER which is connected to an electrical recording circuit.
       • 3. The time interval, t between the sending & receiving of the ULTRASOUND SIGNAL AFTER THE REFLECTION FROM THE SEABED is measured. v = velocity in sound (in water)

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