Topic 4 Waves(completed)

Question 1

Waves transfer ____and____ without transferring___

Answer 1

Information
Energy
Matter

Question 2

What is frequency

Answer 2

The number of waves that pass a point a second

Question 3

What is wavelength

Answer 3

The distance between the same point on 2 different waves

Question 4

What is amplitude

Answer 4

The height of a wave

Question 5

The time it takes for a complete wave to pass

Question 6

Wavefronts are the same points on 2 waves

Question 7

Wave speed is how far a wave travels in a second

Question 8

What is the 2 equations involving wave speed

Answer 8

Wave speed= distance/time
Wave speed=frequency multiply wavelength

Question 9

What is used to measure frequency

Answer 9

Herts
Hz

Question 10

What are longitudinal and transverse waves

Answer 10

Transverse-direction of travel perpendicular to direction of vibration(waves)
Longitudinal-direction of travel in parallel to direction of vibration

Question 11

All waves on electromagnetic spectrum are ______

Answer 11

Transverse

Question 12

What type of waves are sound waves

Answer 12

Longitudinal
Cannot travel in space because of vacuum

Question 13

What piece of equipment is used to measure speed of sound in air

Answer 13

An oscilloscope

Question 14

How do you measure ripples on water surface using a strobe light

Answer 14

Place paper(screen)under tank of water
Use dipper that dips in and out of water to create waves
You will see wave pattern made by shadows of wave crests that are the wavelengths

Question 15

When a wave reflects off a surface what happens

Answer 15

The wave bounces back off of it

Question 16

When a wave is absorbed by a material what happens

Answer 16

The wave can’t travel through or bounce back and doesn’t go anywhere

Question 17

What is refraction

Answer 17

When a wave changes direction and speed when passing through a different medium

Question 18

If a wave passes through a new material what is this called

Answer 18

Transmissio
Wavelengths in more dense materials isn longer

Question 19

Explain how refraction works

Answer 19

When a wave passes into a new medium that is more dense it’s ssleed will slow down and it will bend slightly towards the normal

Question 20

Different substances may absorb ,transmit,refract or reflect waves in different ways that vary with the wavelength of a wave

Question 21

1What are sounds with frequencies less than20 Hz called
2What are sounds with frequencies more than20,000Hz called

Answer 21

1 Infrasound
2 Ultrasound

Question 22

What are 2 uses of ultrasound

Answer 22

Sonar detecting
Foetal scanning in babies

Question 23

What is the process in the human ears for how they hear things(6 things)

Answer 23

Ear canal-ear drum -tiny bones-cochlea-hairs-auditory nerves

Question 24

Explain how each does it’s job
Ear canal
Ear drum
(3)Tiny bones
Cochlea
Hairs
Auditory nerves

Answer 24

Ear canal-directs and funnels sound waves to ear drum
Ear drum -vibrates when sound hits it
(3)Tiny bones-vibrate and pass onto the cochlea
Cochlea-contains fluid that controls balance and detects frequencies of sound
Hairs-create electrical impulses
Auditory nerves-send electrical impulses to the brain
Hairs-

Question 25

Explain how ultrasound is used for foetal and sonar scanning

Answer 25

Ultrasound wave sent out Hits object /structure Bounces back of structure back to where it came from Ultrasound detector defects there is an object there

Question 26

Which of these could be the frequency of ultrasound A 45Hz B 450Hz C 4500Hz D 45000Hz

Answer 26

D 45000Hz 2 (+20000Hz)

Question 27

The speed of a wave is 3 km/s And has a frequency of 100Hz What is the wavelength

Answer 27

Wavelength=Wave speed/frequency 3km/s=3000m/s 3000/100=30m 30 Metres

Question 28

Give a use of infrasound waves

Answer 28

Exploring the underground of the earth

Question 29

When earthquakes happen there are 2 waves that occur what are they called

Answer 29

P(primary) wave S(secondary) wave

Question 30

What type of wave is p wave

Answer 30

Longitudinal less dangerous

Question 31

What type of wave is S wave

Answer 31

Transverse more dangerous

Question 32

What is a shadow zone of a wave

Answer 32

A part where a p or S wave doesn’t reach in the earth

Question 33

S waves are transverse Transverse waves can only move through solid When transverse waves pass through the earth and and pass through core the refract and pass through and when they enter the mantle and outer core they begin to refract away in the liquid

Question 34

P waves are longitudinal Longitudinal waves can pass through solids liquids and gases When the p waves pass through the earths core they begin to refract but when they enter the mantle and outer core they refract even more and speed up and bend away