Waves

Question 1

What is a wave?

Answer 1

A wave is a vibration, which carries energy but not matter.

Question 2

What are the two main types of wave?

Answer 2

Transverse and Longitudinal

Question 3

4 MARKER; What is the relationship of of the vibration and direction the wave is moving, in each type of wave?

Answer 3

TRANSVERSE; Vibration is at a right angle to the direction the wave is moving.

LONGITUDINAL; Vibration is parallel to the direction the wave is moving.

Question 4

What is the wavelength in a TRANSVERSE WAVE?

Answer 4

The distance from a peak to peak or trough to trough.

Question 5

What is the amplitude?

Answer 5

Half the height of a wave

Question 6

What are compressions and rarefactions?

Answer 6

SLINKY DEMO;

compressions - regions of high pressure, particles are close together

rarefactions- regions of low pressure, particles are further apart

Question 7

What is a wavelength in a LONGITUDINAL WAVE?

Answer 7

The distance from two rarefactions, or compressions.

Question 8

Give an example of a longitudinal wave

Answer 8

SOUND WAVE

Question 9

What is frequency?

Answer 9

Number of waves per second

Question 10

What is a period?

Answer 10

Time for one wave to pass

Question 11

6 MARKER; How does the ear work?

Answer 11

PINNA; sound waves are collected

EAR CANAL; waves travel along the ear canal

EARDRUM; Waves reach eardrum and make it vibrate

OSSICLES; amplify these vibrations

COCHLEA; Turns the vibrations into electrical signals

AUDITORY NERVE; takes signals to the brain

Question 12

How does amplitude affect the sound?

Answer 12

AMPLITUDE affects volume, higher amplitude = louder sound

Question 13

How does frequency affect sound?

Answer 13

FREQUENCY affects pitch of sound, higher frequency= higher pitch

Question 14

What is the speed of sound?

Answer 14

340 m/s

Question 15

How fast is light

Answer 15

300 million m/s

Question 16

3 MARKER; Where does sound travel most quickly, and why?

Answer 16

Solids, because the particles are the most packed together

Question 18

Give two differences between sound waves and light waves

Answer 18

Light Waves are transverse, however sound waves are longitudinal. Light waves can travel through a vacuum, but sound waves cannot.

Question 19

What type of wave is light?

Answer 19

Electromagnetic Waves

Question 20

What is the sound beneath the range of Human Hearing?

Answer 20

Infrasound

Question 21

What is the range of hearing above human hearing?

Answer 21

Ultrasound

Question 22

Give some uses of Ultrasound

Answer 22

Ultrasound Scans
SONAR
Industrial Tests

Question 23

Give some examples of infrasound waves

Answer 23

Earthquakes create booms at infrasound level

Question 25

What speed does EM waves go at?

Answer 25

SPEED OF LIGHT

Question 26

What type of wave is an EM Wave?

Answer 26

Transverse Wave

Question 27

Give the order of the EM Spectrum

Answer 27

Radio Waves
Microwaves
Infra-red radiation
Visible Light
Ultraviolet
X-Rays
Gamma Rays

Question 28

What wavelength is visible light?

Answer 28

400nm to 700nm

Question 29

Give a use of infra-red radiation

Answer 29

Heaters
TV Remotes
Night Vision Cameras

Question 30

Give a few properties of infra-red radiation

Answer 30

Type of Heat
Hotter the object the more infrared radiation it gives off