Flashcards in Waves Deck (72)

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1

## Described transverse wave.

### A type of wave in which the particles oscillate perpendicular to the direction the wave travels.

2

## Examples of transverse waves.

### EM waves, water and s-waves.

3

## Describe a longitudinal wave.

### A type of wave in which the particles oscillate parallel to the direction of wave travel.

4

## Examples of longitudinal waves.

### Sound waves and p-waves.

5

## What is the wavelength of a wave?

### It is the distance between two matching points on neighbouring waves, measured in metres.

6

## What is the amplitude of a wave?

### Amplitude is the maximum displacement of a point from the centre of oscillation, measured in metres.

7

## The larger the amplitude the greater the what of the wave?

### The greater the energy of the wave.

8

## The period of a wave, T, is what?

### The time taken for a point on the wave to move through one complete oscillation.

9

## Frequency of a wave is measured in what?

### Hertz, Hz.

10

## Equation linking time period and frequency of a wave:

###
f=1/T

Where:

f is frequency in Hz.

T is time period in s.

11

## Frequency is a measure of what?

### Number of waves that pass a point in 1 second.

12

## The wave equation is:

###
v=fλ

Where:

v is velocity in ms^-1.

f is frequency in Hz.

λ is wavelength in m.

13

## Electromagnetic waves are transverse, true or false?

### True.

14

## True or false, electromagnetic waves travel at different speeds?

### False, they all travel at the same speed (speed of light).

15

## What speed do electromagnetic waves travel through a vacuum at?

### 3x10^8ms^-1

16

## Typical wavelength for a radiowave is what?

### 10^3m to a few metres.

17

## Typical wavelength for a microwave is what?

### 10^-2m

18

## Typical wavelength for an infrared wave is what?

### 10^-5m

19

## Typical wavelength of visible light is what?

### 10^-7m

20

## Typical wavelength of ultraviolet light is what?

### 10^-8m

21

## Typical wavelength of X-ray radiation is what?

### 10^-10m

22

## Typical wavelength of a gamma ray is what?

### 10^-12m

23

## EM radiation travels by what?

### Oscillations in both the electric and magnetic fields.

24

## Superposition of waves is what?

### Where the waves are both causing the same particle to oscillate causing the amplitudes to be summed.

25

## If two waves of the same wavelength and amplitude are perfectly in phase, what can be said about the amplitude of the resultant wave?

### It is twice the amplitude of one of the initial waves.

26

## When waves cause a resultant wave with a greater amplitude than the initial waves what kind of interference is this?

### Constructive interference.

27

## When two waves have the same amplitude and wavelength but are perfectly out of phase what can be said about the resultant wave?

### There isn’t one. The oscillations of the waves cancel each other perfectly leaving no wave.

28

## When two waves cause a resultant wave with less energy than the initial wave what kind of interference is that?

### Destructive interference.

29

## Waves that are perfectly out of phase have a phase difference of what?

### π

30