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Flashcards in 4 waves Deck (33)
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1
Q

longitudinal

A

parallel to the direction of travel
can’t be polarised

Sound waves

2
Q

waves

A

mechanical
-passes through solid materials by vibrating the particle in the substance

electromagnetic

  • waves can pass through a vacuum
  • electric field and magnetic field are at 90 degrees to each other
3
Q

transverse wave

A

perpendicular to direction of travel

Can be polarised so is a best for transverse waves

Electromagnetic waves and waves on a spring

4
Q

polarisation

A

transverse waves are polarised if they all travel in the same plane
(lights isn’t bright)

5
Q

displacement

A

vibrating particles distance from its equilibrium point

6
Q

amplitude

A

maximum displacement

7
Q

wavelength

A

distance from two nodes

8
Q

cycle

A

max displacement to the next max displacement

9
Q

period

A

time from one complete wave

10
Q

frequency

A

F

11
Q

phase difference

A

1 cycle = 360

a different place in the wave cycle

12
Q

reflection

A

i=r

13
Q

refraction

A

bends towards the normal when a light ray enters a denser substance

14
Q

diffraction

A

narrower gap the waves spread out more

(dish desgin
-bigger dish = stronger signs)

15
Q

(stationary and progressive wave)

frequency

A

s- all particles except at the same frequency

p- all particles vibrate at the same frequency

16
Q

(stationary and progressive wave)

Amplitude

A

s- zero to the maximum

p- same aplitude

17
Q

(stationary and progressive wave)

Phase difference

A

s- mπ

p- 2πd
————
λ

18
Q

harmonic tones

A

example = stationary wave

-sound in a pipe
resonates at certain frequencies
antinode= bottom end
node = other end

-microwaves

19
Q

fundamental wave

A

λ= 2L (2 nodes)
λ= L (3 nodes)
λ=2/3L (4 nodes)

20
Q

fundamental wave frequency

A

only happens at wavelengths of a whole number

F1 = C/2L

F2=C/L

F3=3C/2L

F4=2C/L

21
Q

Oscilloscope

A

specially made electron tube and control curcuits

displacement of the spot is proportional to the applied pd

22
Q

Oscilloscope

peak pd?

A

amplitude * y-gain

23
Q

Oscilloscope

Time

A

time base * one wave distance

24
Q

Speed

A

Distance divided by time

25
Q

Phase

A

Defined as the distance between first zero-crossing and the point in space defined as the orgin

26
Q

Phase difference

A

Difference between two waves having the same frequency and reference to the same point in time

27
Q

True of false

All electromagnetic waves travel at the same speed in a vacuum

A

True

28
Q

Stationary wave

Standing wave

A

Combination of two waves moving in opposite directions, each having the same amplitude and frequency, which results in interference and then the waves are superimposed or destructive

29
Q

Node

A

Part of the wave that stays still

30
Q

Path difference

A

Difference in meters between the length of two paths

31
Q

Coherence

A

A fixed relationship between the phase of waves in beam of radiation of a single frequency. Two beams of light are coherent when the phase difference their waves is constant

32
Q

Interference

A

The process in which two or more light, sound, or electromagnetic waves of the same frequency combine or reinforce or cancel each other, the amplitude of the resulting wave being equal to the sum of the amplitude of the combing waves

33
Q

Monochromatic light

A

Light of a single wavelength