waves - ultrasound

Question 1

what are ultrasounds?

Answer 1

sound waves with a frequency higher than the upper limits of human hearing so at least 20,000 Hz

Question 2

do ultrasound reflect?

Answer 2

partially at the boundary between 2 different densities

Question 3

what is ultrasound scanning used for?

Answer 3

• producing images of internal organs such as heart or kidney as long as organ isn’t surrounded by bone
• images of foetus
• used in industrial imaging to detect hidden defects or a problem with the weld

Question 4

how is ultrasound scanning safer than x-rays?

Answer 4

does cause mutations or increase risk of cancer

Question 5

how to work out distance of ultrasound?

Answer 5

s = v x t
distance (m) = speed (m/s) x time (s)

divide answer by 2 if you’re only working out one direction not the direction and reflection