mocks - waves

Question 1

amplitude and wavelength

Answer 1

amplitude - distance vertically from centre line to top and centre of wave.
wavelength - stance from beginning of wave and goes through and up and down and then back to middle of wave on centre line

Question 2

frequency of waves

Answer 2

number of waves passing a point per second

Question 3

transverse wave

Answer 3

• PERPENDICULAR to direction of energy transfer
• vibrations up and down and travel side to side

Question 4

longitudinal waves

Answer 4

• PARALLEL to the direction of energy transfer
• travel in the same direction as wave

Question 5

3 wave transport

Answer 5

• absorbed (transfer energy to material)
• transmitted (pass through)
• reflected (…..)

Question 6

6 features of ray diagram

Answer 6

• incoming ray
• reflected ray
• angle of incidence
• angle of reflection
• point of incidence
• normal

Question 7

specular wave reflection

Answer 7

waves reflect in SINGLE DIRECTIONS by a SMOOTH SURFACE

Question 8

diffuse wave reflection

Answer 8

waves reflect in SCATTERED DIRECTIONS by a ROUGH SURFACE (matt)

Question 9

electromagnetic spectrum

Answer 9

1. radio waves
2. microwaves
3. infrared
4. visible light
5. ultra violet
6. x-rays
7. gamma rays

Question 10

what’s are the trends for the EM spectrum

Answer 10

increase in frequency
decrease in wavelength

Question 11

refraction

Answer 11

• waves crosses boundary of materials and changes direction
• the waves speeds up or slows down depending on the DENSITY of the materials
• wavelength will change but frequency stays the same

Question 12

optical density

Answer 12

how quick light travels through material

Question 13

how are radio waves made

Answer 13

• oscillating electric and magnetic fields from AC (alternating current)
• attach transmitter to oscilloscope and detect by a receiver

Question 14

how are radio waves used in communications

Answer 14

long waves - large distances around the earth
short waves - blue tooth
very short waves - TV, radios,

Question 15

uses of microwaves

Answer 15

1. satellites - pass easily through atmosphere
2. ovens - absorb and heat molecules in food

Question 16

uses of infrared radiation

Answer 16

• infrared cameras to monitor temps (the hotter the brighter)

Question 17

uses of visible light

Answer 17

• optical fibres (high qualoty glass)

Question 18

uses of ultra violet

Answer 18

1. tanning - UV lamps (dangerous)
2. florescence

Question 19

uses of x-rays

Answer 19

• easily pass through flesh (dangerous in high dosages)

Question 20

uses of gamma rays

Answer 20

medical tracers - injected into body to trace isotopes

Question 21

infrared radiation practice results

Answer 21

• back matt - best surface to absorb and emit radiation
• this is because they can absorb all wavelengths of light and convert them into heat

Question 22

the earths temperatures

Answer 22

• day - lots of radiation absorbed from sun = hot
• night less absorbed = cold

Question 23

what’s is black body radiation

Answer 23

an object that absorbs all radiation (none is reflected or transmitted)

Question 24

ultrasound

Answer 24

• electrical devices made to produce electrical oscillations in a range of frequencies
• these are converted to produce sound waves which are beyond the range of human hearing

Question 25

how is ultrasound used in medical imaging

Answer 25

pre - natal scanning
1. ultra sound waves pass through body - some detected and some pass back
2. timings of this echo and computers produce video images of foetus

Question 26

P-waves and S-waves

Answer 26

P-waves (INSIDE EARTH)
- longitudinal
- solids and liquids
- fast

S-waves (INSIDE EARTH)
- transvers
- only solids
- slow