P5.1 - Wave Behaviour Flashcards Preview

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Flashcards in P5.1 - Wave Behaviour Deck (30)
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1
Q

What is a wave? (2)

A

an oscillation that transfers energy (1) without transferring matter (1)

2
Q

how do sound waves transfer energy?

A

They transfer energy by the molecules vibrating and knocking into neighbouring molecules

3
Q

How do phones communicate ?

A

Using Electromagnetic waves (microwaves if ur being specific)

4
Q

define amplitude

A

the distance from the middle of a wave to the crest or trough

5
Q

Define Wavelength

A

distance from one peak (or trough) to the next peak (or trough) in m

6
Q

define time period

A

the time for one wave to pass a given point or the time for one complete oscillation in seconds (s)

7
Q

define frequency

A

the number of peaks passing a point per second (measured in Hz)

8
Q

What is a rarefaction?

A

A part of a longitudinal sound wave which has low pressure (wide bits - particles spread far apart)

9
Q

what is a compression?

A

a part of a longitudinal wave where the pressure is high

close together lines - because particles are squashed together

10
Q

state 1 example of mechanical waves

A

sound waves

11
Q

what is a mechanical wave?

A

a wave that needs medium or matter to travel through

12
Q

do electromagnetic waves require medium/matter to travel through?

A

no they do not, can travel through vacuum

13
Q

state an example of longitudinal waves

A

sound waves

14
Q

describe the way transverse waves travel

A
  • direction of vibration is perpendicular to the direction of travel of the wave
15
Q

describe one way to model waves

A
  • ripples on water
    TRANSVERSE WAVE
    (surface of water moves up and down, waves travel, water does not) - showed by cork
16
Q

does air move when sound waves move?

A

no - sound is transferred through vibrating molecules, which stay where they are and vibrate about a fixed point

17
Q

what does a time trace diagram do?

A
  • shows how displacement of a wave varies with time

- let us to measure the time period from any point on a wave to point in next

18
Q

what is the equation to find out the time period?

A

1
———
frequency

19
Q

what is the x-axis label on a snapshot diagram?

A

distance travelled

20
Q

what is the x-axis label on a time trace diagram?

A

time (in seconds)

21
Q

what is the formula for wave speed?

A

s = f x w

22
Q

what is the equation to measure wave speed?

A

Wavelength (m) x Frequency (hz)

23
Q

difference between transverse and longitudinal waves (vibration of particles in terms of direction of travel)

A
  • transverse = vibrations at right angles of direction of travel
  • longitudinal = vibrations at same direction to direction of travel
24
Q

considering what kind of wave light travels as, is it a mechanical wave?

A

light travels as an electromagnetic wave

- so no, it is not a mechanical wave as it can travel without a medium (CAN TRAVEL IN A VACUUM)

25
Q

why can longitudinal waves pass through faster in a solid compared to a gas?

A

as particles are very close together, so vibrations can be passed on very fast (faster wave speed)

26
Q

how is the amplitude related to the amount of energy a wave carries?

A

bigger amplitude = more energy the wave carries

27
Q

how are frequency and wavelength connected?

A

bigger wavelength = smaller frequency

28
Q

what is the equivilant to peaks and troughs in a longitudinal wave?

A

compressions (peaks)

rarefractions (troughs)

29
Q

how are ripples on water surfaces used to model transverse waves

A
  • if cork placed on the surface, it is not carried by the wave (only moves up and down)
  • ripples travel perpendicular to energy transfer
30
Q

how can the speed of a transverse wave be measured using a ripple tank

A

1) light shone through tank
2) dark + light patches appear underneath it as light passes through crests + troughs
3) count number of times a dark patch passes through a point in a minute, divide by 60 = frequency
4) measure wavelength by the distance between each dark patch between waves
5) then use v = f x w to calculate speed