Zesty physics CH 9 range equation

How is time of flight related to depth?

• directly related

• inversely related

Do greater pulse distances prolong or shorten time of flight?

• prolong

• shorten

Do smaller or larger pulse distances shorten time of flight?

• smaller

• larger

• there is no difference

What is the average speed of sound in soft tissue?

• 15.4 cm/ms

• 1540 m/s

• 1.54 mm/µs

• all answers are correct

How are time of flight and distance a pulse travels related?

• directly

• inversely

How is the depth of a reflector calculated?

• SPL/2

• 1.54 x go-return-time divided by 2

• mm x MHz over 6

• operating frequency/

  bandwidth

What is the 13 µs rule?

• For every 13 µs of go-return-time, the reflector depth is 10 cm deeper in soft tissue

• For every 26 µs of go-return-time, the reflector depth is 1 cm deeper in soft tissue

• For every 26 µs of go-return-time, the reflector depth is 10 cm deeper in soft tissue

• For every 13 µs of go-return-time, the reflector depth is 1 cm deeper in soft tissue

If it takes 39 µs for the time-of-flight, what is the reflector depth?

• 1 cm

• 2 cm

• 3 cm

• 4 cm

If it takes 13 µs for the time-of-flight, what is the reflector depth?

• 1 cm

• 2 cm

• 3 cm

• 4 cm

If it takes 26 µs for the time-of-flight, what is the reflector depth?

• 1 cm

• 2 cm

• 3 cm

• 4 cm