P1.1 waves and the earth

Question 1

What are frequencies bellow 20Hz called

Answer 1

Infrasound

Question 2

Name 2 animals that communicate using infrasound?

Answer 2

Elephants 🐘

Giraffes 🐾

Question 3

Name a natural event that creates infrasound

Answer 3

Volcanic eruptions 🔥

Question 4

What are P waves

Answer 4

Longitudinal

Question 5

What are S waves

Answer 5

Transverse

Question 6

Which are faster P or S waves

Answer 6

P waves are faster

Question 7

What is frequency measured in?

Answer 7

Hertz (Hz)

Question 8

If a earthquake happens under the sea, what could it cause?

Answer 8

A tsunami 🌊

Question 9

What are the plates of the earth called

Answer 9

Tectonic plates 🌎

Question 10

What word describes the number of waves passing a point each second?

Answer 10

Frequency

Question 11

Can humans hear infra sound?

Answer 11

No

Question 12

Some uses of infra sound in nature?

Answer 12

Predicting a volcanic eruption

Question 13

Formula for distance

Answer 13

Distance=Speed x Time

Question 14

What are sounds with a frequency above normal human range called?

Answer 14

Ultrasound

Question 15

Name two animals that use sound to locate objects

Answer 15

Dolphins 🐬

Bats 🌲

Question 16

When sound waves hit an object what can happen to them?

Answer 16

Reflect and refract

Question 17

What is the name of waves produced by an earthquake?

Answer 17

Seismic waves

Question 18

What are the two names of seismic waves

Answer 18

P and S waves

Question 19

What do p waves do

Answer 19

Push and pull

Question 20

How do S waves move

Answer 20

From side to side

Question 21

Name the layers of the earth from outside to the inside in order

Answer 21

Crust
Mantle
Outer core
Inner core

Question 22

What is the name of the apparatus that measure seismic waves

Answer 22

Seismometer

Question 23

Which layer of the earth is liquid

Answer 23

Outer core

Question 24

Which waves don’t travel through liquid?

Answer 24

S waves

Question 25

Why is it important to locate the point of an earthquake

Answer 25

How to prevent, why it happened, any causes

Question 26

Which travel fastest p or S waves

Answer 26

P waves

Question 27

Which waves arrive first

Answer 27

P waves because they travel fastest

Question 28

Why do you need 3 rings on a seismograph

Answer 28

With 2 rings there is 2 possible meeting points

Question 29

Formula for speed

Answer 29

Distance divided by time

Question 30

Name one use of sonar equipment

Answer 30

Carried on ships or submarines to detect fish or find depth of the sea

Question 31

How does ultrasound work?

Answer 31

Different waves are reflected each time they pass into a different medium.

Question 32

What happens to a wave when it reaches a change in rock properties

Answer 32

They reflect or refract at the boundary

Question 33

What causes an earthquake?

Answer 33

The forces on the plated build up until they are big enough to overcome the friction, then the plates move with a sudden jerk, this causes the eartquake

Question 34

How do scientist detect an earthquake?

Answer 34

Scientists use a network of seismometers around the earth

Question 35

How can scientists work out how far away the earthquake was?

Answer 35

The time difference between the first p wave and the first S wave

Question 36

What can data from 3 or more seismometers help you to work out?

Answer 36

The location of the epicentre or point where the earthquake originated

Question 37

What do scientists use the plate boundaries for

Answer 37

To predict where a earthquake might happen

Question 38

What do tsunami warning systems include?

Answer 38

Pressure sensors

Question 39

How fast do tsunamis graves in deep water?

Answer 39

220 m/s

Question 40

Can scientists tell whether or not a tsunami will happen from seismometer tracings

Answer 40

NO

Question 41

Formula for time

Answer 41

Time = distance divided byspeed