When passing another vehicle a driver should wait until the entire car the driver just passed is visible in the rear view mirror before turning back into the right hand lane?hen a driver is waiting to make a left turn what is the procedure he should takes when the light turns green?   Signal your intention to turn-wait for all opposing traffic to clear-make certain you can complete the turn in safety-make your turn.
These jiggle about at ultrasonic frequencies, sending their vibrations to a thin, quartz glass plate (3), which transmits waves (4) into a basin filled with fluid (5) into which you place the objects to be cleaned. Ultrasound waves can be produced using magnetism instead of electricity. Just as piezoelectric crystals produce ultrasound waves in response to electricity, so there are other crystals that make ultrasound in response to magnetism.
Sonography and Ultrasound Defined. Sonography-sometimes called ultrasonography-is the practice of using high-frequency waves to produce an image for medical analysis. These high frequency waves are called ultrasound waves. Ultrasound waves are a useful method to produce a needed medical image without the use of radiation. You might be most familiar with sonography's role in the field of obstetrics to produce an ultrasound image of an unborn baby.