Frequenc, ultrasound and seismic waves P12.2

What is frequency measured in?

Frequency is measured in hertz (Hz).

1 of 24

What is the period measured in?

Period is measured in seconds (s).

2 of 24

What is the symbol for frequency?

The symbol for frequency is f.

3 of 24

What is the symbol for period?

The symbol for period is T.

4 of 24

What is the equation to find the frequency from the period?

frequency = ¹⁄period
f = ¹⁄T

5 of 24

What is the wavespeed?

- The wave speed is the distance travelled by each wave every second through a medium.
- Energy is transferred by the waves at this speed.

6 of 24

What is the symbol for wave speed?

The symbol for wave speed is V.

7 of 24

What is the equation to find the wave speed?

wave speed = frequency x wavelength
V = fλ

8 of 24

What is the symbol for wavelength?

The symbol for wavelength is λ.

9 of 24

What is the symbol equation for wave speed?

V = fλ

10 of 24

What is the wave speed measured in?

The wave speed is measure in m/s.

11 of 24

What is the wavelength measured in?

The wavelength is measured in m.

12 of 24

What is ultrasound?

Sound waves with a frequency higher than the upper limit of human hearing

13 of 24

Ultrasound waves are partially ________ when they meet a boundary between two different densities

Ultrasound waves are partially REFLECTED when they meet a boundary between two different densities

14 of 24

What can we use to find how far a boundary is for ultrasound?

he time taken for the reflections to reach a detector can be used to determine how far away such a boundary is.

15 of 24

What equation can we use to determine distance using ultrasound

distance = speed x time

16 of 24

What can ultrasound be used for?

Medical and industrial imaging.

It can produce images of any internal organ that isn't surrounded by bone including foetuses

17 of 24

Why is ultrasound preferable over x-rays?

Ultrasound is much safer as it does not cause mutations or increase the risk of cancer

18 of 24

What are seismic waves produced by?

Earthquakes

19 of 24

What are the two main types of seismic waves?

P waves
S waves

20 of 24

Properties of P waves

Longitudinal
Can travel through solids and liquids
Faster speed than S waves

21 of 24

Properties of S waves

Transverse
Can travel through solids only
Slower than P waves

22 of 24

How do P and S waves confirm that the earth has a liquid outer core?

There are certain places on earth where S waves cannot be detected as they cannot pass through liquids (S wave shadow zone)
There are certain places on earth where P waves cannot be detected as they travel faster in solids than liquids

23 of 24

How do P waves confirm that the earth has a solid inner core?

Sometimes faint P waves can be detected in the zone where P waves cannot be detected (p wave shadow zone)

24 of 24

Get Revising

Frequenc, ultrasound and seismic waves P12.2

Other cards in this set

Card 2

Front

Back

Card 3

Front

Back

Card 4

Front

Back

Card 5

Front

Back

Comments

Similar Physics resources: