Waves

Question 1

Progressive Wave

Answer 1

Wave that transfers energy without transferring material, made up of a medium or field oscilating

Question 2

Amplitude

Answer 2

Waves maximum displacement

Question 3

Frequency

Answer 3

Number of wave oscilations passing a point per second

Question 4

Wave Length

Answer 4

The length of one whole oscilation

Question 5

Speed

Answer 5

Distance travelled by the wave per unit time

Question 6

Phase

Answer 6

The position of a certain point in a wave

Question 7

Phase Difference

Answer 7

How much a particle/wave lags behind another particle/wave

Question 8

Period

Answer 8

Time taken for 1 full oscilation

Question 9

In Phase

Answer 9

• 2 points are in phase when they are both at the same point of the wave cycle
• same displacement and velocity
• phase is multiple of 2π
• same frequency and wavelength

Question 10

Transverse Waves

Answer 10

Oscillation of particles is at right angles to the direction of enery transfer

Question 11

Longitudinal Waves

Answer 11

Oscilation of particles is parallel to the direction of enery transfer
- made up of compressing and rarefractions
- cant transfer in a vaccum

Question 12

Polarised Wave

Answer 12

• Oscilates only in one place
• Only transverse
• Provides evidence for the nature of transverse waves

Question 13

Polaroid Sunglasses

Answer 13

Reduce glare by blocking partially polarised light as they only allow oscilations in the plane of the filter

Question 14

TV and Radio Signals

Answer 14

Plane polarised by the orientation of the rods, transmittging and recieving aerial must be aligned in the same plane to recieve the same

Question 15

Super Position

Answer 15

• When the displacement of the 2 waves are combined as they pass each other
• Resultant displacement is the sum of each waves displacement

Question 16

Constructive Interference

Answer 16

When 2 waces have displacement in the same direction

Question 17

Deconstructive Interference

Answer 17

• When one wave has positive displacement and other has negative displacement
• If they have equal but opposite displacements, total destructive interference occurs

Question 18

Stationary Wave

Answer 18

• formed from the superposition of 2 progressive waves, travelling in opposite directions
• no energy is transferred

Question 19

How stationary microwaves are formed

Answer 19

• by reflecting a microwave bean at a metal plate
• to find the nodes and antinodes use a microwave probe

Question 20

How stationary sound waves are formed

Answer 20

• place a speaker at one end of a closed glass tube
• lay powder in the tube
• power will shake at the nodes and be stationarry at the antinodes

Question 21

Path Difference

Answer 21

Difference in the distance travelled by 2 waves

Question 22

Coherent Light Source

Answer 22

Same frequency and wavelength and fixed phase difference
- EG Lasers