Flashcards in Waves Deck (184)

Loading flashcards...

1

## What is a progressive wave?

### Vibrations through the air that carries energy from one place to another without transferring any material

2

## How is a wave produced?

### Caused by something making particles or fields oscillate at a source

3

## What happens to the energy at the source of a wave?

### It decreases as the wave transfers energy away from the source

4

## What is reflection?

### When a wave bounces back when it hits a boundary

5

## What is refraction?

### When a wave changes direction as it enters a different medium

6

## Why does a wave change direction (refracts) when it enters a different medium?

### Because the wave speeds up or slows down

7

## What is diffraction?

### When a wave spreads out as it passes through a gap or round an obstacle

8

## What is the displacement of a wave?

### How far a point on the wave has moved from it's undisturbed position

9

## What is the SI units of the displacement of a wave?

### Metres

10

## What is the amplitude of a wave?

### The maximum displacement of a wave (e.g. distance from undisturbed position to peak or trough)

11

## What is the SI units of the amplitude of a wave?

### Metres

12

## What is the wavelength of a wave?

### The length of one whole wave cycle (e.g. distance from peak to peak or trough to trough)

13

## What is the period of a wave?

### The time taken for one whole wave cycle

14

## What is the SI units of the wavelength of a wave?

### Metres

15

## What is the SI units of the period of a wave?

### Seconds

16

## What is the frequency of a wave?

### The number of whole wave cycles per second passing a given point

17

## What is the SI units of the frequency of a wave?

### Hertz

18

## What is the phase of a wave?

### A measurement of the position of a certain point along the wave cycle

19

## What is the phase difference of a wave?

### The amount by which one wave is behind another

20

## What is the phase and phase difference of a wave measured in?

### Degrees or radians as an angle or in fractions of a cycle

21

## How do you work out the phase difference of 2 different waves?

### Work out the difference between 2 identical points on each wave (e.g. the peak of both waves)

22

## What equation links frequency and time period?

### F = 1 / T

23

## What is the wave speed?

### The speed that a wave travels at

24

## What is the equation for wave speed?

### Wave speed = Frequency x Wavelength

25

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

### 3x10^8 ms^-1

26

## What is a transverse wave?

### A wave where the oscillations are at right angle to the direction of energy propagation

27

## Are EM waves transverse or longitudinal?

### Transverse

28

## How do transverse waves travel?

### As vibrations through magnetic and electric fields

29

## What are 3 examples (except EM waves) of a transverse wave?

###
Waves on a string

Waves on water

Seismic S-waves

30