physics lecture 2 summary

1 cycle per second is equal to:

• 1 MHz

• 1 kHz

• 1 Hz

• 1 GHz

1000 cycles per second is equal to

• 1 Hz

• 1 kHz

• 1 MHz

• 1 GHz

13,000,000 cycles is:

• 13 Hz

• 13 kHz

• 13 MHz

• 13 GHz

Ultrasound works by sending _____ into the body and collecting the _____ that reflect back to the transducer.

• sound

  echoes

• sound

  reflections

• waves

  echoes

• waves

  reflections

When the machine is ______ the sound energy ______ through the patients tissues.

• on

  penetrates

• transmitting

  propagates

• working

  pierces

• transmitting

  penetrates

When the machine is collecting echoes it is:

• transmitting

• on time

• off time

• receiving

When the machine is transmitting it is:

• transmitting

• on time

• off time

• receiving

The on/off pattern of waves is called:

• power wave

• continuous wave

• sound wave

• pulse wave

Each pulse consists of:

• any number of cycles

• cycles of even numbers only

• one continuous sound

• a single burst of sound

The spatial pulse length is:

• the spacing of a pulse

• the pulse length

• the time of a pulse

• the distance of a pulse