Appilication of waves

Question 1

v= ? x ?

Answer 1

v = f x λ

Question 2

wave speed is measured in (m/s) what should the frequency be measured in?

Answer 2

(f) should be measured in Hertz, Hz

Question 3

λ stands for wavelength, what should wavelength be measured in?

Answer 3

(λ) should be measured in meters, m

Question 4

to calculate the time period it can either be T =1/f or f =1/t . what do you call this type of relationship?

Answer 4

time period is inversely proportional

Question 5

(T), Period is the?

Answer 5

(T)Time it takes for one whole wave to complete measured in seconds (s)

Question 6

if the direction of energy transfer is straight —–> and the wave direction moves like this: /\/\/\/\/\ what type of wave is it not?

Answer 6

Longitudinal.

Question 7

We learned about a specific type of wave that dolphins use in class that we humans cannot hear what wave is this?

Answer 7

Ultrasound wave - above the human hearing limit. 20,000Hz

Question 8

Definition and name of the process that dolphins use to find others in waters?

Answer 8

Echolocation is the process that dolphins use to find others.

Echolocation is the process of using the reflection of sound to judge the distance to an object : size, shape and vision.

Question 9

In class we learned about uses of ultrasound.

Name a use of ultrasound in identity to humans.

Answer 9

Fetus Imaging - This is to check the baby’s development /if its healthy or not.

Question 10

Partial Reflection was a topic we covered in class with six points to its name,

Describe the process Partial Reflection which has relation to Fetus Imaging
(6 points)

Answer 10

The transducer emits a pulse of ultrasound,
The ultrasound travels through the gel and into the mothers abdomen,
The ultrasound partially reflects it as it changes medium,
The distance from the transducer to the boundary is calculated using distance = speed x time/2,
An image is produced from many thousands of partial reflections from different angles.

Question 11

A transducer is a what? in relation to Partial Reflection.

Answer 11

is a device that converts electrical energy into sound waves and back again, and is used to create images of the inside of the body

Question 12

Why is gel applied to the skin when doing an ultrasound scan?

Answer 12

To prevent air pockets, which can prevent clear images
Improve contact: which helps ultrasound make more contact with skin which improves images results
For comfort: as ultrasound probe can glide more smoothly against the patients skin

Question 13

Echolocation is?

Answer 13

Echolocation is the reflection of sound to judge the distance to an object : size, shape and vision. (ultrasound)